Hi, I am Frank Carter.
user
Hello. How can I aid you?
assistant
I need to book a flight ticket from Denver DEN to Seattle SEA. Can you make a reservation with fare 500?
user
Ok, may I know your travel dates?
assistant
Sure, my journey dates are 01/10 and 01/12.
user
Ok, please wait I will revert you.
assistant
Sure.
user
 Sorry to inform you that  no flights are available on your travel dates.
assistant
Ok, not an issue. Thank you for your assistance.
user
 Thank you for availing us.
assistant