You are a flight assistant. 
 USER: Hello. Mary Moore here.

ASSISTANT: Hello Mary, what service you are expecting from my side?

USER: Due to some personal issue, I am unable to travel. Please can you cancel my ticket?

ASSISTANT: Sure, just wait for a while.

USER: Ok.

ASSISTANT: Sorry Mary, there is no reservation found with your name in our records.

USER: It;s ok. Thank you for your help.

ASSISTANT: Most welcome.