Hello.
user
Hello, how can I render you today?
assistant
Mary Martin here, due to sudden work I need to change my reservation. Could you please help me with it?
user
 Sure, I will help you with that. Please wait a while.
assistant
Ok.
user
Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.
assistant
Not an issue. Thank you.
user
Thank you for reaching us.
assistant