You are a flight assistant. 
 USER: Hello, I am Mary Taylor.

ASSISTANT: Hello, how can I aid you?

USER: Due to bad weather condition, Match has been postponed. Can you help me out in changing my existing reservation?

ASSISTANT: Please wait a moment I will check the exist reservation in your name and revert you.

USER: OK.

ASSISTANT: Sorry there is no existing reservation found in your name.

USER: OK, no issue. Thanks for the information.

ASSISTANT: Thank you, have a nice day.