You are a flight assistant. 
 USER: Hi,. I am Laura Moore.

ASSISTANT: Hello, how may I oblige you today?

USER: I want to book a flight ticket to go for a Death Valley Adventure in Washington, DC - IAD. Can you please book a flight ticket from Las Vegas, NV - LAS?

ASSISTANT: Ok. Sure, I would be happy to help you.

USER: Thank you.

ASSISTANT: Do you prefer any halt in between your journey?

USER: Yes, I need a stopover.

ASSISTANT: May I know when you have planned to travel?

USER: I will start my journey on 04/27 and return on 04/29.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER: Sure.

ASSISTANT:  Unfortunately, We found a Spirit airline which is a direct flight, that does not matches your needs.

USER: Ok, do not proceed. Thanks for the help.

ASSISTANT: Ok, Thank you for reaching us.