You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Susan Clark.

ASSISTANT: How may I guide you?

USER: I am planning to cancel my recent reservation, due to health issue. Can you please cancel my ticket?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Susan, no reservation has been found on your name in our database.

USER: That's fine. Thank you for your service.

ASSISTANT: Thank you for choosing us.