You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. In which way I can aid you at this moment?

USER: I am Mary Rodriguez want to visit Boston to attend a workshop, can you book a ticket within the fare of 1000?

ASSISTANT: Sure, I am happy to help you with that. Can you please mention your preferable travel dates for booking flight ticket?

USER: Sure, my travelling dates will be 07/12 and 07/14.

ASSISTANT: May I know your preferable airport code names for further process?

USER: Yes, I want to fly from DFW to BOS.

ASSISTANT: Just hold on a moment, I will check flight availability in this route.

USER: Ok.

ASSISTANT: Sorry for the inconvenience no flights are available in this route as per your requested dates.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to complete my journey.

ASSISTANT: Thank you for reaching us, have a good day.

USER: Thank you.