You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: Can you please check the availability of flights in between the points Las Vegas and Washington?

ASSISTANT: Sure, we are euphoric to help you. Can I have your name please?

USER: Sure, I am Larry Miller.

ASSISTANT: May I know from where you are flying and landing at?

USER: My source airport code is Las Vegas, NV - LAS. I want to land at Washington, DC - IAD.

ASSISTANT: When are you planning to make your journey?

USER: My travelling dates are 11/20 and 11/22.

ASSISTANT: In which class, you prefer to go?

USER: I am comfortable with any class.

ASSISTANT: Thanks for your details, please wait.

USER: Ok, I will wait.

ASSISTANT: Thanks for your patience, we found a connecting flight with 1001 number and the price is 100.

USER: Ok, please proceed for booking.

ASSISTANT: Ok, I have reserved your ticket in Delta airlines.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us.