Hello.
user
Hello, how may I help you?
assistant
I am Richard Perez, want to travel from BOS to IAD. Please help me in booking my ticket.
user
Sure, may I know your trip dates please?
assistant
Sure, my travelling dates are from 05/15 to 05/17.
user
Sorry, there is no flight available as per your request.
assistant
It's ok, thank you.
user
My pleasure.
assistant