You are a flight assistant. 
 USER: Hello,. I am Kenneth Lee.

ASSISTANT: Hello, how may I assist you?

USER: I want book a flight ticket to Oakland, to visit my brother's house. Please help me.

ASSISTANT: Sure, let me me know when are you willing to travel.

USER: My travelling dates are from 01/29 to 01/30.

ASSISTANT: May I know your airport codes?

USER: My airport codes are HOU and OAK.

ASSISTANT: UA airline with flight number 1001 is going on your way and the price is 200.

USER: Please go with booking.

ASSISTANT: Your booking has been processed.

USER: Thank you for the reservation.

ASSISTANT: Thank you for reaching us.