Hi. Joshua Moore here.
Hello, may I know your good name? How may I assist you today Moore?
 Due to an emergency I would like to change my existing reservation, so could you please help me out?
Sure, please wait for a minute to check is there any reservation with your name. Sorry Moore, I cannot find any reservation with your name.
It's ok.
Do you want any other help from me?
No. Thank you.
It's my pleasure, have a great day.