You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Helen Thomas, want to travel from ORD to DCA. Please help me in booking my ticket.

ASSISTANT: Sure, I will help you. May I know your depart and arrival dates?

USER: Sure, my trip dates are from 08/17 to 08/19.

ASSISTANT: Let me know your fare limit.

USER: Sure, the fare of the flight should be 5000.

ASSISTANT: Give me a minute, I will let you know the flight availability.

USER: Sure.

ASSISTANT: Thank you for your time, there is a flight available with fare 100 and single connection in Delta airline. May I confirm your ticket in economy class?

USER: Please proceed with the booking.

ASSISTANT: Your ticket has been reserved with flight number 1004.

USER: Thank you for your help.

ASSISTANT: Thank you for opting us.