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

ASSISTANT: Hello, how can I help you for the day?

USER: Could you help me in booking a flight ticket from Houston to Boston on Sept 19?

ASSISTANT: Can you please mention the airline codes?

USER: My source and destination airport codes are IAH and BOS.

ASSISTANT: Can you mention your return day flight?

USER: I want to return on Sept 21.

ASSISTANT: Ok. Do you want any halt in between your journey?

USER: Yes, I need a halt.

ASSISTANT: Sure, do you prefer any class?

USER: I am comfortable with any class.

ASSISTANT: Ok. Your flight number is 1003 with a fare 100 and the airline is AA.

USER: You can proceed to booking.

ASSISTANT: Sure. Your ticket has been reserved with economy class.

USER: Thank you.

ASSISTANT: Thank you for reaching us.