Hello.
user
Hello, what can I do for you today?
assistant
Can you  please book a flight ticket from IAD to SFO?
user
Sure, may I know your travel dates please?
assistant
Thank you. I have planned my travel  dates as Mar 19 and Mar 21.
user
Do you want to fly in economy class or business class?
assistant
I am ok with any class but I would like to return in morning time so please make sure that.
user
Any other preferences you have?
assistant
I am looking for single connecting flight.
user
Can you mention your name to proceed further?
assistant
Sure, myself Sandra Taylor.
user
Sorry, no flights found as per your requirement.
assistant
Oh! It is sad to hear. Anyway, thank you for your time.
user
Thank you for contacting us.
assistant
Most welcome.
user