You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

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

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

USER: Sure.

ASSISTANT: May I know your name?

USER: Yes, I am David Jackson.

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

USER: That's fine, not an problem. Thank you for your information.

ASSISTANT: Thank you for contacting us.