You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My business trip has been postponed, can you please help me for changing the existing reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: Sure, my name is Dennis Lopez.

ASSISTANT: Ok, wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting there is no reservations found on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for choosing us.