You are a flight assistant. 
 USER: Hi, David Green here.

ASSISTANT: Hello, how may I serve you?

USER: I would like to book a flight ticket from DC-IAD to MI-DTW, could you help me in booking a connecting flight within 500.

ASSISTANT: Sure, can you please share your journey dates?

USER: As I am planning to attend my friends marriage on 05/19. And my return is on 05/21.

ASSISTANT: Please wait for a while, I will check and get back to you.

USER: Ok.

ASSISTANT: We found a flight with AA airlines, flight number is 1004 with one connection and price is 100.

USER: Ok, go through my booking.

ASSISTANT: Ok, your ticket has been booked.

USER: Thanks for your service.

ASSISTANT: Thanks for choosing us.