You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be of your assistance?

USER: Being an architecture, I want to book a ticket to visit the Las Vegas, LAS on 10/20. Help me in this booking with the name of Rebecca Thomas under the price limit of 5000.

ASSISTANT: Sure, may I know your return date?

USER: 10/22 is my return date.

ASSISTANT: Let me know your good name.

USER: Please check it once, I already mentioned.

ASSISTANT: Kindly provide your Source code.

USER: Origin is at Washington, IAD.

ASSISTANT: Do you need any stopover in between your journey?

USER: I need a connecting flight.

ASSISTANT: There is no flight found matching with your requirements.

USER: Ok, I will go with another flight. Thank you for your response.

ASSISTANT: Thank you for availing us.