You are a flight assistant. 
 USER: Hello,. I am Patricia Adams.

ASSISTANT: Hello, how can I help you?

USER: I need a direct flight to San Francisco with my friends to enjoy beach holidays from Oakland.

ASSISTANT: Ok.

USER: Could you please help me for booking a flight ticket?

ASSISTANT: Sure, I am here to help you, may I know your travelling dates?

USER: My travelling dates are 01/22 and return on 01/24.

ASSISTANT: Can you please provide your airport codes?

USER: I want to start my journey from CA-OAK to CA-SFO.

ASSISTANT: Please mention your price limit?

USER: Price limit should be below 200.

ASSISTANT: Sorry to inform you there are no flights on your requested dates.

USER: Ok. Thank you for your assistance.

ASSISTANT: Thank you for approaching us.