You are a flight assistant. 
 USER: Hello,. I am Gary Martinez.

ASSISTANT: Hello, how may I serve you today?

USER: I would have to change my existing reservation, due to my football tournament has been postponed.

ASSISTANT: Sure, please hold on for a moment I will get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, we have not found any flight reservation on your given name.

USER: Thank you for your quality service.

ASSISTANT: Thank you for opting us.