You are a flight assistant. 
 USER: Hello. My name is Dorothy Brown.

ASSISTANT: Hello. How may I help you today?

USER: I would like to cancel my reservation, could you help me out?

ASSISTANT: Sure, I will help you with that.

USER: Sure, take your time.

ASSISTANT: Please wait for a while. I am sorry to say that there is no reservation found under your name.

USER: That's ok. Thank you for your help.

ASSISTANT: Thank you for contacting us.