You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how exactly I can serve you the best today?

USER: I want to change my reservation due to some emergency issues, will you assist me in changing?

ASSISTANT: Sure, I can help you.

USER: Ok.

ASSISTANT: May I know your good name please?

USER: Sure, my name is Benjamin Wilson.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there is no reservation found in your name.

USER: No problem, thanks for your kind service.

ASSISTANT: Thank you for choosing us.