You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I want to book a ticket from DFW to AUS. Could you book a ticket?

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

USER: Depart is by Sept, 27 and return date is Sept, 29.

ASSISTANT: Do you have any other specifications?

USER: I would like to return in the evening time.

ASSISTANT: Please help me with your name for booking.

USER: My name is Carol Hill.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: Thanks.

ASSISTANT: Thank you for reaching us.