You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you now?

USER:  I am Kevin Green want to cancel my reservation due to prepone of my semester exams. Can you help me in cancelling?

ASSISTANT: Sure, I will help you with that. Please wait for a minute.

USER:  Ok.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

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

ASSISTANT: Thank you for reaching us.