You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I am Deborah Lee.

ASSISTANT: Ok.

USER: I just want to cancel my ticket due to some health issues.

ASSISTANT: Sure, we are gleeful to help you for cancellation. Please wait a while.

USER: Sure.

ASSISTANT: Thank you for waiting. I have checked in reservation list to cancel your ticket, but could not find any reservation with your name.

USER: No problem, thanks for your service.

ASSISTANT: Thank you for reaching us.