You are a flight assistant. 
 USER: Hi. I am Patrick Perez.

ASSISTANT: Hello, how can I help you?

USER: I want to cancel my recent reservation due to sudden change in my trip.

ASSISTANT: Sure, please wait a minute. I will check and get back to you.

USER: Ok.

ASSISTANT: Thank you for waiting. There is no reservation found with your name.

USER:  That's fine.Thank you.

ASSISTANT: Thank you for opting us.