You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am invited to Philadelphia Museum of Art at Philadelphia, can you please book me a ticket?

ASSISTANT: Sure, I will help you in booking flight ticket.

USER: Thank you.

ASSISTANT: Could you please mention your preferable airport code names?

USER: Sure, my nearest origin airport code is DCA and my nearest destination airport code is PHL.

ASSISTANT: Is it one way or round trip?

USER: It is round trip.

ASSISTANT: Can you please help me with your departure and return dates for booking flight ticket?

USER: Sure, I have planned to depart on 02/17 from DCA and would like to return on 02/19 from PHL.

ASSISTANT: Ok, please wait a moment, I will check flight availability.

USER: Sure, check the flight service with a 1 connection limit for me.

ASSISTANT: Sure. Sorry, there is no flights available as per your requested dates.

USER: Ok, not an issue. I will find any alternate for this trip.

ASSISTANT: May I know your name for documentation purpose?

USER: My name is Patricia Lee.

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

USER: Thank you for providing information, I am happy with your service.

ASSISTANT: Welcome.