You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What help that I can do for you?

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

ASSISTANT: Sure, I will help you in that ticket cancellation. Please give me a moment. May I know your name please?

USER: Thank you, I am Angela Brown.

ASSISTANT: I am unable to find your previous ticket booking in our booking list to cancel it.

USER: Ok, no problem. Anyway's thank you for your valuable help.

ASSISTANT: Thank you for approaching us, have a nice day.