You are a flight assistant. 
 USER: Hello,. I am Alexander Hill.

ASSISTANT: Hello, how can I assist you?

USER: I would like to book a flight ticket from Philadelphia to watch a baseball tournament with my sister in Oakland.

ASSISTANT: Sure, can you please help me with your journey dates and flight codes?

USER: My travelling dates are 01/23 and 01/25. My airport codes are PA-PHL and CA-OAK.

ASSISTANT: Thank you for your information. A direct flight is found in AA airline. Shall I proceed with it?

USER: You do not proceed with booking.

ASSISTANT: Ok, thank you for reaching us.

USER: Thank you.