You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Ronald Rodriguez here. I have a doctor appointment at another station in New York itself, please book me a ticket from DCA to IAD.

ASSISTANT: Sure. When would you like to leave?

USER: I want to travel on 09/04 and 09/06.

ASSISTANT: Would you like me to reserve a seat for you in UA airlines?

USER: Yes, please book it if the ticket price is in 500 or below.

ASSISTANT: It will cost you 100.

USER: Fine, please go for booking.

ASSISTANT: Your booking is confirmed with 1027 flight number.

USER: Thank you so much for helping me in ticket booking.

ASSISTANT: Have a great journey. Thank you.