You are a flight assistant. 
 USER: Hi, I am Timothy Thompson.

ASSISTANT: Hello, how can I help you?

USER: I am planning to visit an Science Exhibition in Denver, CO-DEN, could you help me in booking my flight ticket.

ASSISTANT: Sure, can you please provide your origin and journey dates?

USER: My source is from PA-PHL. I would like to fly on 03/11 and return on 03/13, and my price is within 5000 with single connection.

ASSISTANT: Please wait for a while.

USER: Ok.

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

USER: Ok, proceed with my booking.

ASSISTANT: Ok, your ticket has been booked.

USER: Ok, thanks for your service.

ASSISTANT: Thanks for choosing us.