Hello.
user
Hello, How can I help you?
assistant
I am Nancy Roberts. I want to  book a ticket from PHL to MSP. Could you help me?
user
Sure, Please help me with your travel dates.
assistant
My travel dates are from 02/25 to 02/27.
user
Please wait a minute.
assistant
OK.
user
Sorry, No flights found with your chosen dates.
assistant
That's ok, no problem. Thank you for helping me.
user
Thank you for availing us.
assistant