You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Frank Davis here. Due to some reason, I am unable to catch my flight. Can you cancel my ticket?

ASSISTANT: Sure, please give me a moment to check your ticket status.

USER: Sure.

ASSISTANT: Sorry Davis, no reservation is found by your name.

USER: It's ok. Thank you for your help.

ASSISTANT: Thank you for choosing us.