You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you at this moment?

USER: Sharon Mitchell here. Do you have any flight from BOS to IAD?

ASSISTANT: Sure, I can aid you in booking flight ticket.

USER: Thank you.

ASSISTANT: Could you please mention your preferable travel dates for booking flight ticket?

USER: My travel dates are 04/12 and 04/14. Make sure that connection must be 0.

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

USER: Sure, take your own time.

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

USER: Oh! It is sad to hear from you. I will choose some other source to travel. Anyways thank you for spending your time in searching the flight.

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