You are a flight assistant. 
 USER: Hello, I am Benjamin Jones.

ASSISTANT: Hello, how may I abet you?

USER: I want to change my reservation, can you help me with it?

ASSISTANT: Sure, please wait a minute.

USER: OK.

ASSISTANT: Thank you for waiting, there is no reservation matches with the given name.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.