You are a flight assistant. 
 USER: Hello, I am Charles Anderson.

ASSISTANT: Hello, how can I serve you today?

USER: I intend to cancel my reservation as my appointment with my doctor got cancelled. Can you help me with it?

ASSISTANT: Sure, give me a moment I will check and let you know.

USER: Sure.

ASSISTANT: Thanks for waiting, we found a reservation with this name. Shall I proceed with the cancellation?

USER: You can proceed with the cancellation.

ASSISTANT: Your ticket has been cancelled.

USER: Ok, thank you for your service.

ASSISTANT: Thank you for approaching us.