Hello.
Hello. What can I do for you?
Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?
Sure, I am ready to help you with that. On which name  you have  booked your previous reservation?
I am Emma Miller.
Ok, please allow me a couple of seconds to check your ticket status.
Sure.
I regret to tell you that, I haven't found your previous reservation in our database to change the details.
Ok, no issues. Thanks for the information.
You are welcome. Thank you for choosing us.