Hello.
user
Hello, how may I serve you at this moment?
assistant
I want to book a ticket from LAS to IAD to go for Cultural event.
user
Sure, I will help you. Please send your travelling dates.
assistant
My travelling dates are Sept 25 and Sept 27.
user
Do you have any preferences?
assistant
I prefer normal-cost airline.
user
May I know your name?
assistant
Sure, I am Emma Miller.
user
Sorry, there is no flight available with your requirements.
assistant
Ok, no issues. Thank you.
user
You are welcome, have a nice day.
assistant