You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am William Williams.

ASSISTANT: How can I help you?

USER: I have already reserved my ticket, but right now I want to cancel that reservation. Can you help me to cancel reservation?

ASSISTANT: Sure, just a second please.

USER: Sure.

ASSISTANT: I am sorry no reservation found on your name .

USER: It's ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you.