You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you at this moment?

USER: I am Charles Martin, I need to cancel my ticket due to emergency. Can you help me?

ASSISTANT: Sure, please give me a moment.

USER: Take your time.

ASSISTANT: Sorry, no ticket is existing on your name.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.