You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Barbara Walker. I am planning to cancel my reservation, due to some urgent work.Can you please cancel my reservation?

ASSISTANT: Yes, I can help you with that.

USER: Ok, take your own time.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching us.