You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am Cynthia Brown, I want to book a flight ticket to IAD from LAS in the month of January. Can you please help me out?

ASSISTANT: Sure, I can aid you in booking flight ticket. Could you please mention your preferable travel dates for booking flight ticket?

USER: Sure, my travelling dates are 01/31 and 02/02.

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

USER: Sure.

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

USER: Not a problem, anyways thank you for the information.

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