You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Christopher Perez. I am planning to meet my friends in DCA. Can you book a ticket from LAX?

ASSISTANT: Sure, could you please provide your preferable travel dates?

USER: My travel dates are from 03/29 to 03/31.

ASSISTANT: Ok, let me check for the availability of flight.

USER: Ok.

ASSISTANT: Christopher, there is a flight available with AA airline and the price 200.

USER: Please book the ticket.

ASSISTANT: Your booking is confirmed with 1007 flight number. You are welcome.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing our service, have a great day.

USER: You are welcome.