You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I am John Williams. I am planning to cancel my reservation, can you help me?

ASSISTANT: Sure, I will help you with that. Please wait for a while.

USER: Sure.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: That's fine. Anyway, thank you for your help.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.