Hi. I am Rebecca Wright.
Hello, how can I help you?
 I already had a reservation for my holiday trip but, suddenly I need to attend a client meeting at head quarters. So I need to change my reservation. Can you please help me with that?
Sure, I will help you. Please wait, let me check your reservation status in our database.
Ok.
Sorry, I did not find any reservation under your name in our database.
Ok, no problem. Thank you for your response.
You are most welcome and thank you for contacting us.