You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what kind of help you are looking from our side?

USER: I would like to change my reservation, can you please help me out with that?

ASSISTANT: Sure, we can help you with that?

USER: Thank you.

ASSISTANT: May I know your name to check your reservation status?

USER: Charles Nelson here.

ASSISTANT: Ok, just wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that, we could not find any reservation with your respective name.

USER: That's ok, no problem. Thank you for checking out.

ASSISTANT: Thank you for approaching us.