Hello. I am Mark Hernandez.
Hello, how may I assist you at  this moment?
I need to book a ticket from IAH to PHL, can you help me in doing that?
Sure, May I know on which dates you wish to travel?
My travelling dates are Mar 21 to Mar 23.
Do you have any class preference?
I am comfortable with any class.
May I know your price limit please?
I can pay you 200.
We found a AA airlines, flight number 1009 with connecting flight in economy class, and the fare of 100.
Ok, please proceed with booking.
Your ticket has been reserved.
Thank you.
Thank you for opting us.