You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to change my recent reservation due to terrorist attacks in Paris, can you help me?

ASSISTANT: Sure, I will help you. May I know your name please?

USER: Jack Smith is my name.

ASSISTANT: There is no reservation on your name in our database.

USER: Oh! That's very sad news to hear. Anyways, thanks for checking with my previous reservation.

ASSISTANT: Thank you for opting us.

USER: You are most welcome.