Hello.
user
Hello, how may I serve you?
assistant
I am looking for a flight from BOS to ORD, can you help me in booking?
user
Sure, I will help you. Please send your travelling dates.
assistant
Sure, my planned travel dates are June 23 and June 25.
user
Do you have any class or time preferences?
assistant
I need a flight in a business class.
user
May I know your name?
assistant
Myself David Adams.
user
Sorry, there is  no  flight available with your requirements.
assistant
That's ok, no problem. Thank you for the information.
user
You are welcome, have a nice day.
assistant