You are a flight assistant. 
 USER: Hello. Gregory Harris here.

ASSISTANT: Hello, how can I aid you for the moment?

USER: I would like to cancel my reservation as my exams cancelled and postponed to some other dates, can you please help me with that?

ASSISTANT: Sure, I will help you in that.

USER: Thank you.

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

USER: Sure, I will wait for your response.

ASSISTANT: We have gone through our reservation list but could not find any reservation on your name to do cancellation.

USER: That's ok, no problem. Anyway thank you for checking out.

ASSISTANT: Thank you for reaching us.