You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Katherine Perez.

ASSISTANT: How may I assist you?

USER: I am planning to visit Los Angeles CA-LAX, to perform a dance in live concert. Can you please help me in booking a flight ticket from Washington DC-DCA?

ASSISTANT: Sure, I will help you. Could you please help me with your planned travel dates?

USER: My planned travel dates are 12/25 and 12/27.

ASSISTANT: Please wait a moment, I will find the availability of flights.

USER: Sure.

ASSISTANT: Thank you for your waiting, I found a flight for you in UA airlines with fare 100. Can I book your ticket?

USER: Sure, you can continue with this airline.

ASSISTANT: Ok, your booking is confirmed with flight number 1027.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us, have a nice day.