You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is Margaret Parker, I would like to book a flight ticket please.

ASSISTANT: OK,can you please provide your travelling information?

USER: Sure, my departure is from San Francisco, CA-SFO  and destination is Atlanta, GA-ATL.

ASSISTANT: Can I know the information regarding  travelling dates?

USER: I would like to flying out on May 14 and flying back on may 16.

ASSISTANT: Wait for a moment.

USER: Please make sure that I need a price limit of 200 with one connection. OK.

ASSISTANT: Sorry to tell that there is no flight found.

USER: OK, thanks for your information.

ASSISTANT: Thanks for contacting us. Have a great day.