I hope your vacation gives you the pleasure you need so that you dont have to think of any problems back at home.

How to reply enjoy your trip. Next start to create a list of things that interest you in those locations. If you feel the need to reply to the e-mail you should keep is just as succinct as theirs eg. May it be smooth and may you enjoy your trip.

We wish you an amazing vacation this year. The statement sounds like it is about the holiday you just had in the past in which case you could respond with Thank you I did or Thank you I had a lovely holiday. The world is your oyster my dear friend.

Lol I wont say it as a joke right now because I was there once when it always felt odd. Have a wonderful trip dear friend. Be careful and assure that your journey is safe.

Congratulations on your trip. May your journey be eye opening. Wishing a dear friend a safe journey.

Talk about how busy the airport was Or just answer with a non sequitor. Enjoy is just common e-mail courtesy and generally doesnt need a response. It is good you can finally go on vacation youve worked hard all the time so you deserve to have a fun time.

May your journey be filled with joy and happiness. Well were off for London. Dear boss have a Happy Trip.