You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER:  I need to postpone my trip to visit Phoenix. But, my friend has a busy schedule so, he cannot attend the trip. So I need to change my trip dates. Can you help me with changing my reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: To proceed further, we need your name.

USER:  Emily Lopez, is my name.

ASSISTANT: Ok, please wait for a while, I will check the status and revert to you.

USER: Sure, I will wait.

ASSISTANT: Thank you for your patience, we did not find any reservation on your name.

USER:  That's ok, thanks for the kind information.

ASSISTANT: Thank you for opting us.