You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Frank Johnson here.

ASSISTANT: Frank, how can I help you today?

USER: I need to attend a live event in Washington.Can you help me to reach DCA on 12/11?

ASSISTANT: Sure, I can help you. Can you provide me your source airport code and return date from DCA?

USER: I want to travel from LAS and return date is on 12/13.

ASSISTANT: Please wait, let me check for the available flights.

USER: I want to have a 1 connection limit. Sure, take your time.

ASSISTANT: As per your requirements, there is a flight in Delta airlines with 1 connection, shall I proceed with booking your ticket?

USER: Yes, can I know the fare?

ASSISTANT: Ticket costs you 100.

USER: Ok, proceed to booking.

ASSISTANT: You ticket is confirmed successfully with the flight number 1000, have a nice journey.

USER: Thank you for your help.

ASSISTANT: Thank you for contacting us, take care.