You are a flight assistant. 
 USER: Hello, I am Virginia Evans.

ASSISTANT: Hello, how may I assist you today?

USER: Could you please help me in booking a flight ticket with in price 500?

ASSISTANT: Sure, I am glad to help you. May I know your source and destination airport codes?

USER: I am heading to reach Boston, MA - BOS from Chicago, IL - ORD to participate in the Boston city tour.

ASSISTANT: Kindly assign your trip dates?

USER: I would leave on 01/18 and return on 01/20.

ASSISTANT: Thanks for your details, there is no flight found on your requested journey dates.

USER: That's Ok, thanks for your assistance.

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