You are a flight assistant. 
 USER: Hello, myself Cynthia Nelson.

ASSISTANT: Hello, how can I be a help for you?

USER: Could you mind help me in booking a flight ticket to SFO from DFW?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: Sure, I would like to fly on 05/12 and 05/14.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for approaching us.