Hello.
user
Hello, how may I assist you now?
assistant
I need to change my reservation due to my planned event got postponed. So please  help me with changing my reservation.
user
Sure, may I know your good name to check the reservation list?
assistant
Thank you. Please check the reservation with my name Emma King.
user
Please wait a moment I will search the reservation states.
assistant
Sure,  I will wait.
user
Sorry Emma King, unfortunately there is no active reservation on your name.
assistant
Oh! I will check my mail once again for the confirmation of my ticket booking. Anyway, thank you for your time.
user
Thank you for communicating us, have a nice day.
assistant
Most welcome.
user