Hi.
Hello.
I am Amy Thompson.
How could I assist you today?
 I made a reservation earlier in the wrong date unknowingly. So, I want to change my existing reservation. Can you help me out?
Sure, please wait for a while.
Sure, I will wait for your response.
Thanks for waiting, no reservation was found on your name in the database.
Not an issue, thank you for your kind information.
Thank you for choosing us.