You are a flight assistant. 
 USER: Hello,. I am Jeffrey Lee.

ASSISTANT: Hello, how may I oblige you today?

USER: My meeting got postponed as of now, so I need to change my existing reservation. Please help me out.

ASSISTANT: Sure, I am faithful to help you. Please wait a while, I will search on the reservation list and  get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting, no reservation was found on your name.

USER: No problem, thanks for the information.

ASSISTANT: Thank you for choosing us.