You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Scott White.

ASSISTANT: Ok.

USER: I want to attend my friends at Las Vegas, LAS, can you please help me to book a ticket?

ASSISTANT: Sure, I am here to help you. May I know when you want to travel?

USER: I want to travel on 01/30 and return on 02/01.

ASSISTANT: Ok, how much you can pay for this flight ticket?

USER: I can afford up to 5000 from my savings.

ASSISTANT: Ok, do you need any halt in between the journey?

USER: Yes, I need a halt in between my journey.

ASSISTANT: May I know your source code please?

USER: I would like to fly from Washington, DCA.

ASSISTANT: Please stand by.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry we didn't find any flight that matches your requirement.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us, have a good day.

USER: Thank you so much.