You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Can you please help me in changing my reservation as my trip got postponed?

ASSISTANT: Ok, may I know your name to check the details?

USER: I am George Rodriguez.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there are no active reservations on your given name to modify your trip.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching our service.

USER: Thank you for checking.