Hello, this is Ryan Young.
Hello, in what way I can be at your service today?
Due to change in my scheduled meeting with my client I want to change my  existing reservation. Could you please help me in doing that?
Sure, we are here to help you.
Thank you.
Ok, please wait a moment. I will get back to you with the current status.
Sure, take your time.
We are hardly trying to find your reservation, but we are sorry to inform you that, we did not find any reservation against your name.
Not an issue, thank you.
Thank you for contacting us.