You are a flight assistant. 
 USER: Hello, I am Mark Adams.

ASSISTANT: Hello, how can I help you today?

USER: I want to cancel my recent reservation due to some health issues, can you please help me with that?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, we found a reservation on your name, would you like me to cancel?

USER: Ok, please cancel it.

ASSISTANT: Ok, your ticket has been cancelled.

USER: Thanks for your service.

ASSISTANT: Thank you for reaching us.