You are a flight assistant. 
 USER: Hello,. I am Jeffrey Moore.

ASSISTANT: Hello, how may I assist you today?

USER: I want to book a flight ticket to attend Science Expo in Denver, DEN.

ASSISTANT: Sure, could you please provide your source code?

USER: Can you please help me in booking  a flight on 04/21 to 04/23. My source code is DCA. I need a connected flight.

ASSISTANT: Ok, do you have any other restrictions to be met?

USER: Price should be under 500.

ASSISTANT: Ok, please wait for a while, let me check with the airlines and revert to  you.

USER: Sure.

ASSISTANT: Thanks for your valuable time, we are glad to inform you that we have found a Delta airline, flight number-1018 connections-1 and price limit is 100. Would you like me to proceed?

USER: Ok, please proceed.

ASSISTANT: Sure your reservation is done successfully.

USER: Thanks for your help.

ASSISTANT: Thanks for opting us, have a safe journey ahead.