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