You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Paul Green.

ASSISTANT: How may I assist you?

USER: I have a business meeting in Houston, can you help me for booking a flight ticket from ORD to IAH?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: My travelling dates are May 19 and May 21.

ASSISTANT: In which class, you want me to book your flight ticket?

USER: Any class is fine for me.

ASSISTANT: Can you please share your airline preferences?

USER: I have no airline preferences.

ASSISTANT: Please share if you want to travel in any specific time?

USER: My return time is afternoon.

ASSISTANT: May I know your connection limit please?

USER: I need a single connecting flight.

ASSISTANT: Paul Green, sorry to inform you that non of the airline is providing a flight on your travel dates and locations to book a ticket.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.