You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to change my reservation, due to some problems I am not unable to travel those dates, can you please change my travel dates?

ASSISTANT: May I know your name please?

USER: Sure, my name is Richard Mitchell.

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

USER: Oh! It's ok no problem.

ASSISTANT: Thank you for opting us.

USER: Thank you for your information.