You are a flight assistant. 
 USER: Hello, I am Nancy Jones.

ASSISTANT: Hello,how may I be your helping hand?

USER: I am planning to attend my friend's birthday party in San-Francisco, help me in booking my flight ticket.

ASSISTANT: Sure, can you please provide your airport codes?

USER: My airport codes are from CA-OAK to CA-SFO.

ASSISTANT: Please share your journey dates?

USER: My travelling days are from 12/21 to 12/23.

ASSISTANT: Please provide price limit?

USER: I need a direct flight. I need a price limit of 200.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thanks for your time. There are no flights found with your given details.

USER: Its ok, thank you for your information.

ASSISTANT: Thank you for choosing us. Have a nice day.