You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Is this flight ticket booking agency?

ASSISTANT: Yes, you are at right place. How can we help you today?

USER: I want to go Austin, for giving a seminar to students about science and technology, can you please book a flight ticket for me from Washington?

ASSISTANT: Sure, can you please provide me your journey dates?

USER: I want to departure on 12/26 and return date is 12/28.

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: My take off from DCA airport and destination airport is AUS.

ASSISTANT: Please wait for a moment, let me check.

USER: Ok.

ASSISTANT: May I know your name please?

USER: Sure, my name is Sandra Edwards.

ASSISTANT: Edwards, there is a flight from UA airlines, shall I proceed for booking your ticket with this airlines?

USER: Yes, please book this flight ticket on my name.

ASSISTANT: Your ticket is confirmed successfully with the flight number 1000.

USER: Thank you for your help.

ASSISTANT: Thank you for contacting us, have a safe journey.

USER: Welcome.