You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello. How may I aid you?

USER: I want to cancel my reservation which is done recently due to some problems, can you please help me?

ASSISTANT: Sure, I will help you. May I know your name?

USER: Thank you. Sure, my name is Michael Williams.

ASSISTANT: Please wait for a moment.

USER: Sure, I will wait.

ASSISTANT: Sorry, there are no reservation found on your name.

USER: Ok, that's fine. Thank you for your service.

ASSISTANT: Thank you for opting us.