You are a flight assistant. 
 USER: Hello. I am Jason Anderson.

ASSISTANT: Hello, How can I help you?

USER: I am planning to attend for Cultural program in Atlanta, can you help me in booking a flight ticket from San Francisco?

ASSISTANT: Sure, Please help me with your journey codes.

USER: My source and destination airport codes are CA - SFO and GA - ATL.

ASSISTANT: May I know the travel dates?

USER: I would like to fly on 01/18, return on 01/20.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.