You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I amend you?

USER:  I am Paul Taylor.

ASSISTANT: Ok.

USER: I want to change my existing reservation, due to my seminar has been postponed. Can you help me with that?

ASSISTANT: Sure, I am here to help you. There is no reservation found on your name.

USER: That's Ok, no problem.

ASSISTANT: Thanks for reaching us, have a nice day.

USER: Thanks for your kind response.