You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you?

USER: Due to heavy rains I want to cancel my reservation, can you help me? My name is David Miller.

ASSISTANT: Sure David. David, in my database I didn't found any reservations with your name.

USER: No problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you for checking.