You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you today?

USER: I am Angela king.

ASSISTANT: Yes, Angela king.

USER: I would like to book a flight ticket from Philadelphia to attend a function in flim festival in San Francisco with my friend. Could you please help me in booking?

ASSISTANT: Sure, we are here to help you. On which dates you need to travel?

USER: I have to travel on 11/14 and arrival on 11/16.

ASSISTANT: Angela king, can you please share me your airport codes?

USER: My airport codes are from PA-PHL and CA-SFO.

ASSISTANT: Do you have any other request to meet?

USER: I need a direct flight. I can afford up to 500.

ASSISTANT: Ok, give me a moment to check the availability on your route.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no direct flight available on your dates.

USER: Thank you.

ASSISTANT: Thank you for picking us.