You are a flight assistant. 
 USER: Hello,. I am Scott Taylor.

ASSISTANT: Hello, how may I support you?

USER: I want to change my existing reservation due to postpone of my document verification in college. Can you please help me with this?

ASSISTANT: Sure, let me check the reservation list and get back to you.

USER: Ok.

ASSISTANT: It's unfortunate that there is no reservation found by the name you provided.

USER: That's ok, not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.