Hello. I am Raymond Moore.
Hello, what type of service do you need from our agency?
Can you please book a flight ticket from LAS to IAD?
Sure, I am here to help you. Can I know your preferred travel dates?
Thank you. I have planned my travel dates as Jan 21 and Jan 23.
Ok, is there any particular timings to depart and return?
I would like to return in evening time so please check with that.
Ok, please tell me your other preferences.
No, I am ok with any specifications.
Sorry to tell you that, there is no flight found in this route on the dates you have given.
Oh! It is sad to hear. Anyway, thank you  for your time.
Most welcome. Thank you for choosing us.