You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I have planned to book a flight in business class from Houston, so please help me in booking a flight on Dec 27th.

ASSISTANT: Sure, we are pleased to serve you. May I know your airport codes?

USER: Sure, my airport codes are IAH - DEN.

ASSISTANT: Is there any airline preference for you?

USER: Yes, I need a normal-cost airline.

ASSISTANT: When you will return to Houston?

USER: I intend to return on 29th of the same month.

ASSISTANT: Would you like to prefer direct flight or connecting flight?

USER: I prefer a connecting flight.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: Ok, no issues.

ASSISTANT: For documentation, may I know your name please?

USER: Sure, my name is Kathleen Garcia.

ASSISTANT: Thank you for choosing us.