You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gary Lopez.

ASSISTANT: How may I serve you for the day?

USER: I want to cancel my reservation due to my recent trip has been postponed.

ASSISTANT: Ok.

USER: Help me to cancel my ticket.

ASSISTANT: Sure, please be on hold.

USER: Sure.

ASSISTANT: Thank you for your time. Sorry, we did not find any reservation in your name.

USER: Ok, thank you for your response.

ASSISTANT: Thank you for opting us.