You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you today?

USER: Could you please change my existing reservation?

ASSISTANT: Sure, may I know your name please?

USER: My name is James Clark.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry, we could not find any reservation on your name.

USER: Not a problem, thank you for checking.

ASSISTANT: Thank you for approaching us.