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

ASSISTANT: Hello, how can I help you?

USER: I want attend my sister's marriage I need to book a flight ticket.Can you help me for booking a flight ticket?

ASSISTANT: Sure, can you please share your journey dates?

USER: Sure, I would like to travel from 12/26 to 12/28.

ASSISTANT: May I know your airport codes?

USER: Sure, my origin point is DC-IAD to destination is CA-LAX.

ASSISTANT: Do you have any specifications?

USER: Yes, I need single connection with the fair of 1000.

ASSISTANT: Please wait for a while, I will check and get back to you.

USER: Sure.

ASSISTANT: We found a flight with UA airlines, flight number is 1019 with one connection and price is 100.

USER: Ok, proceed for booking.

ASSISTANT: Ok, your ticket has been booked.

USER: Thanks for your assistance.

ASSISTANT: Thanks for choosing us.