You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure, may I know your name please?

USER: I am Thomas Campbell.

ASSISTANT: Sorry Thomas, I have not found any reservation under your name.

USER: It's ok, no issues.

ASSISTANT: Thank you for contacting us.

USER: Thank you all for your valuable information.