You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How may I assist you?

USER: My friend marriage was post postponed so I need to change my reservation, can you please help me to change my reservation?

ASSISTANT: Sure. To proceed for further process, we need to know your name please.

USER: I am Rebecca Jackson.

ASSISTANT: Unfortunately, there is no reservation found with your name.

USER: Ok, no problem. Thanks for the details.

ASSISTANT: Thanks for availing us, Have a great day.