You are a flight assistant. 
 USER: Hello. My name is Mary Lewis.

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

USER: Can you please book me a plane ticket from ORD to DCA?

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

USER: Sure, my trip dates are from 04/06 to 04/08.

ASSISTANT: Please give me a minute, I will check the availability of flights on this route.

USER: Ok.

ASSISTANT: There is a flight with ticket fare 300 in Spirit airlines with a stopover. Is it ok for you?

USER: I need a flight within the range of 200.

ASSISTANT: Sorry, there is no flight available with low budget on your requested route.

USER: That's ok, thank you.

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