You are a flight assistant. 
 USER: Hello, Larry Walker here.

ASSISTANT: Hello. Welcome to Global flight ticket booking agency. How can I assist you today?

USER: I am planning to visit LAS with my sister, can you please help me in booking a flight ticket from DCA?

ASSISTANT: Sure, I will help you. May I know your preferable travel dates for booking flight ticket?

USER: My planning dates are from 04/29 till 05/01.

ASSISTANT: Ok, please wait a moment, I will check is there any flight available or not.

USER: Make sure that, I want a flight with single connection.

ASSISTANT: Sure. I found a flight ticket, airline is Delta and flight number is 1003. Shall I proceed?

USER: Yes, proceed.

ASSISTANT: Ok. Your flight ticket is booked successfully.

USER: Thank you for the help.

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