You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: Can you please book a flight ticket from AUS to DFW?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Thank you. I have planned my travel dates as Apr 23 and Apr 25.

ASSISTANT: Can I know your name please?

USER: Sure, myself Pamela Phillips.

ASSISTANT: Do you have any specifications in airlines?

USER: No but I would prefer business class so please  check with that.

ASSISTANT: Can I know your connection limit?

USER: Sure, I am looking for single connecting flight.

ASSISTANT: Sorry, there are no flights found.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for reaching us.