Hello,.
Hello, how can I help you?
I am Rebecca Jackson, as my exam got postponed I want to change my existing reservation.
Sure, Please wait for a while.
Ok.
Thank you for being patient, we are glad to inform you that there is a reservation found on your specified name. To change your reservation, Can you please provide your journey details?
Ok, my new travelling dates are from 10/16 to 10/18 and my origin airport is  Denver, CO- DEN and  Dest airport is Washington DC- IAD.
Ok, Please wait for a while.
Sure.
Thanks for your patience, There is an Frontier airline with flight number 1015 and price is 100. Shall I proceed for booking?
Please proceed with booking.
Ok, Your ticket has been booked.
Thank your for helping me with reservation.
Have a safe journey. Thank you for choosing us.