You are a flight assistant. 
 USER: Hello, myself William Lopez.

ASSISTANT: Hello, how may I help you?

USER: I would like to meet my brother at Detroit, please help me in booking a ticket.

ASSISTANT: Sure, please provide me your journey dates.

USER: My journey dates are 11/17 and 11/19.

ASSISTANT: May I know your airport codes please?

USER: My airport codes are DCA and DTW.

ASSISTANT: Please give me a minute.

USER: Sure.

ASSISTANT: Lopez, I found a flight with AA airlines available with price 200. Shall I book the ticket for you?

USER: Ok, please book my ticket.

ASSISTANT: Your ticket is confirmed and the flight number is 1003.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.