You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you now?

USER: I want to book a ticket from CLT to HOU. Could you book a ticket?

ASSISTANT: Ok, can you please mention your desired dates for this journey?

USER: Departure is Apr, 1 and return date is Apr, 3.

ASSISTANT: Do you need a connecting flight?

USER: I prefer connecting flight.

ASSISTANT: May I know your other preferences?

USER: I would like to prefer business class.

ASSISTANT: Please mention your good name.

USER: My name is Donna Smith.

ASSISTANT: I am so sorry to say, there are no flights available currently for your journey.

USER: Thank you.

ASSISTANT: Thank you for choosing our services. Have a nice day.