Hello.
Hello, how may I assist you?
I want to change my existing reservation, can you please help me out in changing my reservation?
Sure, may I know your name?
Myself Thomas Thompson.
Thomas, could you please wait for a while?
Sure.
Sorry Thomas, there is no reservation available for you. May I be of any other help to you?
Oh! That's fine I'll choose other option to travel. Thank you for helping me out.
My pleasure Thomas.