You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to cancel my reservation due to some business meeting postponed, can you please help me in this?

ASSISTANT: Sure, may I know your name?

USER: Sure, my name is Stephen Clark.

ASSISTANT: Please give me a moment to check our website.

USER: Sure, I will wait.

ASSISTANT: Sorry Clark, no reservation is available by your name.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: Thank you for contacting us.