You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I guide you for today?

USER: I am Christine Taylor. Can you help me in booking a flight ticket from DCA to LAS?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: I want to travel on 09/23, and need to catch return flight on 09/25.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: Make sure to check a flight with in a price limit of 200.

ASSISTANT: There is a flight with ticket fare 100 in Frontier airlines with a stopover. Is it ok for you?

USER: No, do not proceed. I need a direct flight. Thanks for the information.

ASSISTANT: Thank you for contacting us, have a nice day.