You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I want to change my reservation, because my trip was postpone due to some problems, can you please change my reservation?

ASSISTANT: Sure, I can help you with that.

USER: Thanks.

ASSISTANT: May I know your name for checking your previous status?

USER: Myself Daniel Robinson.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: There is no previous reservation found on your name.

USER: It's ok. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a nice day.