Hi. Joshua Moore here.
user
Hello, may I know your good name? How may I assist you today Moore?
assistant
 Due to an emergency I would like to change my existing reservation, so could you please help me out?
user
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.
assistant
It's ok.
user
Do you want any other help from me?
assistant
No. Thank you.
user
It's my pleasure, have a great day.
assistant