You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gary Lee.

ASSISTANT: How may I assist you today?

USER: Unfortunately my exams was got postponed so I want to cancel my reservation, can you please help me to cancel my reservation?

ASSISTANT: Sure, I'll help try to help you in cancellation.

USER: Thank you.

ASSISTANT: Please wait a moment I will check the reservation status.

USER: Ok, I will wait for your response.

ASSISTANT: Thank you for waiting, sorry to inform you that there is no reservation found by your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.