You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: Please help me to book a flight ticket from ATL to IAH.

ASSISTANT: Sure, I will help you with that. Can you please provide your travelling dates?

USER: My travelling dates are from Dec, 14 to Dec, 16.

ASSISTANT: Any connection limit do you have?

USER: I need a single connecting flight.

ASSISTANT: May I know your name to book the flight ticket?

USER: My name is Betty Carter.

ASSISTANT: Is there any other specifications do you have?

USER: I prefer to return in the afternoon.

ASSISTANT: Please wait a moment to check the flights.

USER: Ok.

ASSISTANT: Unfortunately there are no flights running on your route with your required preferences.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us, have a great day.