You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am planning to visit National Gallery of Arts at DCA, can you help me with booking?

ASSISTANT: Sure, could you please provide your boarding point?

USER: My boarding point is IAD.

ASSISTANT: Kindly mention when you are willing to travel?

USER: My trip dates are Oct 26 and Oct 28.

ASSISTANT: Are you looking for any preferred class?

USER: No.

ASSISTANT: Do you have any other specifications to be met?

USER: I need a connecting flight.

ASSISTANT: Can I have your name to proceed further?

USER: I am Nancy Jackson.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for opting us.