You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I want to cancel my recent reservation due to some personal problems. Can you help me?

ASSISTANT: Sure, please give me a moment to check your ticket status. May I know your name?

USER: Yes, I am Joseph King.

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

USER: That's fine, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.