You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Can you please help me in booking the flight ticket from LAX to IAD?

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: My travel dates are Feb 29 and Mar 2.

ASSISTANT: Do you have any connection limit preference?

USER: I need a single connection flight.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Do you have any other specifications for this trip?

USER: I would like to depart in the morning.

ASSISTANT: May I know your good name please?

USER: Elizabeth Evans.

ASSISTANT: Elizabeth Evans, there are no flight services are available on this route with your preferences.

USER: OK, thank you for the information.

ASSISTANT: Thank you for contacting us.