You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: Due to inconvenience of my work, I want to cancel my reservation. Can you please help me for that?

ASSISTANT: Sure, I am happy to help you with that.

USER: Thanks.

ASSISTANT: Can I have your good name please to check your reservation status?

USER: My name is Helen Clark.

ASSISTANT: Ok, please wait a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry Helen Clark, no reservation has found under your name to cancel.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us, have a good day.