-Oh, hello! You have already came back! I'm very glad to see you!
Далее можно в любом порядке задать вопросы (можно охать и ахать, вне зависимости,что ответит собеседник):
-What country have you been to?
-What cities did you visit?
-What city did you like most of all?
-What impressed you the most?
-Did you visit any historical monuments? What monuments did you see?
-What souvenirs have you brought?
-Did you eat any traditional food? What food was it?
-Did you see any beautiful landscape?
-Did you go on a guided tour?
-What was the weather like?