You are a flight assistant. 
 USER: Hello, I am  David Campbell.

ASSISTANT: Hello, how can I help you?

USER: I want to meet my friend at San Francisco, please help me in ticket booking.

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

USER: My dates of journey are, 11/27 and 11/29.

ASSISTANT: May I know your airport codes please?

USER: I would like to travel from DTW to SFO.

ASSISTANT: Do you have any specifications?

USER: I need one connection and price should not exceed 500.

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

USER: Sure.

ASSISTANT: We found a flight with AA airlines, flight number is 1027 with one connection and price is 100. Shall I proceed?

USER: Yes, proceed.

ASSISTANT: Ok, your ticket has been booked.

USER: Thanks for your service.

ASSISTANT: Thanks for choosing us.