You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: William Robinson here.

ASSISTANT: How can I assist you?

USER: Unfortunately, I want to cancel my recently done reservation. Can you please help me in this?

ASSISTANT: Sure William, please wait a moment.

USER: Sure, take your time.

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

USER: That's fine.

ASSISTANT: Thank you for approaching us.

USER: You are welcome.