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

ASSISTANT: Hello, How may I amend you today?

USER: I want to change my existing reservation as my scheduled dates for trip has been postponed.

ASSISTANT: Ok.

USER: Will you help me in changing my reservation?

ASSISTANT: Sure, I will the reservation list and revert to you.

USER: Thank you.

ASSISTANT: Thanks for your time.

USER: Ok.

ASSISTANT: I have gone through the reservation list, but your name is not reserved earlier.

USER: Ok, thank you for sharing the information.

ASSISTANT: Thank you.