Hi.
Hello. How may I assist you?
 I am having sudden meeting in my office, can you please help me changing my reservation?
Sure, before that can you help me by giving your name to find your reservation.
Sure, my name is Mary Lewis.
Please wait a moment, let me check the status of reservation.
Ok, take your time.
Thanks for your time, there is no reservation found on your name.
That's fine, no problem. Thank you for checking.
Thanks for reaching us.