You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Could you please book a flight ticket to Las Vegas, LAS from Philadelphia, PHL within the fare of 200?

ASSISTANT: Sure. May I know your travelling dates?

USER: I want to travel on 01/18 and return back on 01/20.

ASSISTANT: Do you have any connection limit?

USER: I need a halt in between my journey.

ASSISTANT: May I know your name?

USER: My name is Ronald Lee.

ASSISTANT: Thanks for your details. There are no flights found on your data.

USER: No problem, thank you for your information.

ASSISTANT: Thank you.