Hello.
Hello, how may I provide assistance to you?
I had planned a trip with my friend and now they want to change it. Can you help me to change my reservation?
Sure, we are here  to help you. Could you please provide your name to check your previous reservation status?
My name is Karen Garcia.
Ok, please be on hold.
Sure.
Sorry we did not find any reservation with your name.
No worries. Thank you for checking it.
Thank you for availing us.