Hello.
Hello, how may I render you?
I want to change my existing reservation due to some technical issues, can you help me with that?
Sure, I am here to help you.
Thank you.
May I know your good name please, to check the reservation list?
I am Mary Parker.
Please wait for a while.
Sure.
Thanks for your valuable time, there is no reservation found in your name.
Ok, no worries at all.
Thanks for your kind approach.