Page 568 - Practical English Usage 3ed - Michael Swan, Oxford

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journeys etc
Common ways of wishing people a good journey are: Have a good trip. Have a good journey. (BrE) Safe journey home. (BrE)
After a journey (for example when we meet people at the airport or station), we may say:
Did you have a good joumey/triplflight?
How was the journey/triplflight?
If somebody is leaving for an evening out or some kind of pleasant event, people might say Have a good time! or Enjoy yourself! (especially in American English sometimes just Enjoy!). Good luck! is used before examinations or other difficult or dangerous events.
When people return home, their friends or family may say
Welcome back/home.
holidays
Before somebody starts a holiday, we may say:
Have a good holiday. (AmE ... vacation.) OR Have a good time. When the holiday is over, we may say:
Did you have a good holiday/vacation?
meals
We do not have fixed expressions for the beginnings and ends of meals. It is common for guests or family members to say something complimentary about the food during the meal (for example This is very nice), and after (for example That was lovely/delicious; thank you very much). Some religious people say 'grace' (a short prayer) before and after meals. Waiters often say Enjoy your meal after serving a customer.
For the names of meals. see 347.
drinking
When people begin drinking alcoholic drinks socially, they often raise their glasses and say something. Common expressions are Cheers! (BrE) and Your health! When we drink to celebrate an occasion (such as a birthday, a wedding or a promotion), we often say Here's to .. .!
Here's to Betty!
Here's to the new job! Here's to the happy couple!
sending good wishes
Typical expressions are Give my best wishes/regards/greetings/love to X, Remember me to X. Say hello to Xfor me. When the wishes are passed on, common expressions are X sends his/her best wishes/regards etc, X says hello.
sympathy
Common formulae in letters of sympathy (for example on somebody's death) are I was very/terribly/extremely sorry to hear about ... and Please accept my deepest sympathy.
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'social' language 545
page 536