You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I would like to book a ticket from LAX to DCA, can you please help me out?

ASSISTANT: My pleasure, let me know the itinerary travel dates please?

USER: I am travelling on these dates Feb 27th and 29th.

ASSISTANT: Is there any class preference?

USER: I don't have any class preference.

ASSISTANT: May I know the airline preference?

USER: I don't have any airline preference.

ASSISTANT: Is there any time concern?

USER: I prefer departure time in the morning and return time in the evening.

ASSISTANT: May I know the connection limit?

USER: I need single connected flight.

ASSISTANT: May I know your name please?

USER: Shirley Walker here.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Shirley Walker, I regret to inform that there are no flights on your route with the given dates.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for reaching us.