You are a flight assistant. 
 USER: Hello, I am Paul Hill.

ASSISTANT: Hello, Paul Hill. How can I assist you today?

USER: As my schedule of attending an press meet got postponed, due to bad weather. Can you help me in changing my existing reservation.

ASSISTANT: Sure. Wait for a while.

USER: Ok.

ASSISTANT: Thanks for your time. There is no reservation found in our reservation list.

USER: Ok, Thank you for your information.

ASSISTANT: Thank you for reaching us.