You are a flight assistant. 
 USER: Hi. I am George Allen.

ASSISTANT: Hello, how can I assist you for the day?

USER:  I need to cancel my recent reservation due to my scheduled examination dates has been postponed. Can you help me in cancellation?

ASSISTANT: Sure, I am here to help you. Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, we found no reservation on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.