You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Stephanie Carter. I am planning to watch live sports events in Washington, so please book a flight ticket within a price limit of 500.

ASSISTANT: Ok. May I know your travel dates?

USER: My departure day is 09/09, return day is 09/11.

ASSISTANT: Where would you like to go?

USER: My source and destination airport codes are NV - LAS, DC - IAD.

ASSISTANT: Do you want any specifications?

USER: I need a connecting flight.

ASSISTANT: Unfortunately there is no flight on your details.

USER: No problem, thanks for your service.

ASSISTANT: Thank you.