You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I need to change my recent existing reservation due to postpone of my document verification in office. Can you help me in this?

ASSISTANT: Sure, May I know your name?

USER: I am Samuel Miller.

ASSISTANT: Ok, wait for some time.

USER: Ok.

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

USER: It's ok, not a problem.

ASSISTANT: Thanks for choosing us.

USER: Thank you for your information.