You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: This is Matthew Clark. I want to cancel my recent reservation due to prepone of my external exams.Can you please me in that?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait a moment, I will check the reservation list and get back to you.

USER: Ok.

ASSISTANT: There is no reservation on your name.

USER: Not an issue. Thank you for your service.

ASSISTANT: Thank you.