You are a flight assistant. 
 USER: Hello, Joseph Lewis here.

ASSISTANT: Hello, Joseph. How can I help you today?

USER: As I met with an accident, I will not be able to meet my client. Could you cancel my reservation?

ASSISTANT: That's sad to hear, I will help you with that. Please wait for a while.

USER: Take your time.

ASSISTANT: Sorry Joseph, there is no reservation found on your name.

USER: No problem.

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

USER: Thank you for assisting me.

ASSISTANT: You are welcome.