You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Dorothy Harris. I need to cancel my reservation due to some crisis in my reservation, can you help me out?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Sorry, no reservation found on your name.

USER: That's ok, no problem. Thank you for your information.

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