Hello.
Hello, how may I assess you?
Actually my Tennis competition is postponed, so that I want change my existing reservation. Can you help me?
Sure, I will help you with that.
Thank you.
Please let me know your good name to check your reservation status.
Sure, I am Joseph Clark.
Ok,  please wait a moment.
Sure.
Sorry Joseph Clark, no reservation has found under your name to change.
Ok, not a problem. Thank you for your service.
Thank you for choosing us, have a good day.