You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,.

USER: I am Mark Gonzalez.

ASSISTANT: How may I help you?

USER: I would like to cancel my recent reservation.due to my sports event has been cancelled.

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: Sorry there is no reservation found with your name.

USER: Thank you for your service.

ASSISTANT: Thank you, have a good day.