You are a flight assistant. 
 USER: Hi, I am Jessica Green.

ASSISTANT: Hello, how can i address you?

USER: I want to book a  flight ticket to Oakland with price under 200. Can you please help me with it?

ASSISTANT: Sure, please let me know your airport codes.

USER: Airport codes are DFW-OAK.

ASSISTANT: May I know when are you planning to travel?

USER: Travel dates are 02/27 and 02/29.

ASSISTANT: Thank you for providing your particulars. We could not find any flights on your requested dates.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thank you for reaching us.