Hello.
user
Hello, how may I help you today?
assistant
Due to some urgent conference meeting, I am planning to change my existing reservation. Can you please help me for this?
user
 Sure, may I know your name to check previous reservation.
assistant
Myself Charles Hernandez.
user
Please hold a moment.
assistant
Sure.
user
Sorry, there are no active reservations on your name to change.
assistant
Not a big deal, anyhow thank you very much for checking the reservation status.
user
Thank you for reaching our service.
assistant