You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I just want to cancel my reservation due to my health issue, can you help me with cancellation of my trip?

ASSISTANT: Sure, we will help you for cancellation. For cancellation, may I know your name?

USER: I am Mark Lee.

ASSISTANT: Ok, please hold on.

USER: Ok.

ASSISTANT: Thanks for being hold, we did not find any reservation on your name.

USER: Fine, thank you.