You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you?

USER: I am Mark Williams. I would like to book a flight ticket from Austin to meet my brother after a long time and surprise to him at Houston.

ASSISTANT: May I know your preferable airport codes please?

USER: My airport codes are TX-AUS and TX-IAH.

ASSISTANT: Could you please provide me your travelling dates?

USER: My depart is on 04/23 and arrival is on 04/25.

ASSISTANT: Thanks for giving your details, please wait a moment, I will check and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, we found a flight on your details with airline AA, flight number: 1006.

USER: You can proceed to booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your kind service.

ASSISTANT: Thank you so much for choosing us. Have a nice day.