You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Could you please book a return flight in afternoon?

ASSISTANT: Sure, is there any connection limit?

USER: Yes, I prefer to travel with a connecting flight.

ASSISTANT: Let me know your journey dates.

USER: I will start my journey on Mar 13 and intend to return on Mar 15.

ASSISTANT: May I know your name please?

USER: Myself Barbara Clark.

ASSISTANT: Can you please share me your boarding and landing airport codes?

USER: Sure, the airport codes are MCO-IAH.

ASSISTANT: Ok, please wait. I will revert to you with the flight details.

USER: Sure.

ASSISTANT: Thanks for waiting, there are no flights available based on your given details.

USER: Ok, thanks for the quick response.

ASSISTANT: Thanks for opting us.