You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I need to change my reservation as I am not able to make my trip right now. Can you assist me about that?

ASSISTANT: May I know your name?

USER: Sure, my name is Margaret Lopez.

ASSISTANT: Please wait for a while.

USER: Sure, I will be waiting for your response.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: Oh! It might not booked properly at the time of booking, anyways thank you for the information.

ASSISTANT: Most welcome.