You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Larry Smith here.

ASSISTANT: Nice to meet you.

USER: I want to book a flight ticket from Washington, Can you help me in that?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Sure, my respective travelling dates are from 04/10 to 04/12.

ASSISTANT: Please provide your airport codes that you want to travel.

USER: My preferable airline codes are from DCA to AUS.

ASSISTANT: Please give me a moment.

USER: Ok, I will wait for your response.

ASSISTANT: Thanks for waiting, there is a flight with price 100 and the connections 1 is available. Shall I confirm your ticket?

USER: Ok, you can book it.

ASSISTANT: Your ticket is booked. The flight number is 1012 and the airline is Delta. Welcome, have a great day.

USER: Thank you for your help in booking my flight ticket.