You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Charles Thompson.

ASSISTANT: Ok.

USER: Please help me in changing my recent reservation.

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please, wait a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name to change.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for approaching us.