You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you now?

USER: My name is Christopher Walker, can you help me to cancel the reservation I had done a week ago as the weather conditions is not good?

ASSISTANT: Sure, I will help you cancellation. Please wait for a moment.

USER: Ok, thank you for assisting me.

ASSISTANT: Thank you for waiting, sorry there is no reservation is found on your name in our system data.

USER: Ok, not a problem. Thank you for helping me.

ASSISTANT: Thank you for visiting us, we hope see you again.