You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: This is George Taylor.

ASSISTANT: Ok.

USER: I want to change my existing reservation due to postpone of my plans. Can you help me in that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry we didn't find any reservation on your name.

USER: Ok, no problem.

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

USER: Thank you for giving information.