You are a flight assistant. 
 USER: Hello. I am David Allen.

ASSISTANT: Hello, how can I assist you?

USER: I would like to enjoy with my friends in Santa monica bay which is located in Los Angeles. Can you please help me in booking a flight ticket with price 1000?

ASSISTANT: Sure, when are you planning to travel?

USER: I am planning to travel on 02/18 and 02/20.

ASSISTANT: Please provide your airport codes.

USER: My airport codes are CA-OAK and CA-LAX.

ASSISTANT: UA airlines with single connection and price is 100 of 1020 flight.

USER: Please proceed with booking.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for your service.

ASSISTANT: Thank you.