You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Due to some health issues, I am unable to travel. So, I have decided to cancel my ticket. Can you please help me?

ASSISTANT: Sure, can you please give your name to proceed further?

USER: Thank you. My name is David Walker.

ASSISTANT: Ok, please be on hold.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no reservation found on your name to cancel.

USER: It's ok, not a problem with that. Thank you for helping me.

ASSISTANT: Thank you for reaching us.