You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Jason Lopez. I want to cancel my recent reservation due to postpone of my exams. Can you help me?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your given name.

USER: That's ok.

ASSISTANT: Thanks for choosing us.

USER: Thank you for your service.