Hi, I am Jonathan Lee.
Hello. How may I address you today?
 Due to sudden change in my trip to another location, I would like to change my reservation. Can you please help me out?
Sure, please wait for a while, I will check the reservation list and revert to you.
Ok.
Thanks for waiting, We hardly tried to find your reservation but, no reservation has been found with your name.
Ok, no problem. Thank you for your response.
Thanks for approaching us.