You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: This is Gregory Lopez. I want to cancel my reservation due to postpone of my external exams. Could you please help me in doing this?

ASSISTANT: Sure, please wait.

USER: ok.

ASSISTANT: Soryy, we don't see any reservation on your name.

USER: Ok, no issues. Thank you for your response.

ASSISTANT: Thank you.