You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

USER: Could you please book a flight ticket from CLT to HOU?

ASSISTANT: Sure, I will help you with that. Can you please provide your name to book the flight ticket?

USER: My name is Kevin Clark.

ASSISTANT: Ok, may I know your preferable dates of travelling?

USER: My travelling dates are Aug 28 and Aug 30.

ASSISTANT: Do you have any connection limit?

USER: I need a single connecting flight.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: I want to return in the afternoon.

ASSISTANT: Any more preferences do you have?

USER: No.

ASSISTANT: Please wait a moment to check the flights.

USER: Sure.

ASSISTANT: We regret to inform you that, there are no flights available for your journey with your requested preferences.

USER: Not an issue, thank you for your information.

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