You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Barbara Carter.

ASSISTANT: What assistance do you need from us?

USER: Due to an emergency, I want to postpone my trip to LGA, could you help me out?

ASSISTANT: Yes, I can help you.

USER: Ok.

ASSISTANT: Sorry to inform you, there is no previous reservation found on your name to change.

USER: That's ok. Thank you for your time.

ASSISTANT: You are welcome. Thank you for reaching us. Have a nice day.