Hi,.
Hello, How exactly I can serve you the best today?
 Due to sudden change in my trip to another location, I would like to change my reservation. Can you please help me with changing?
Sure, we are rapturous to help you in changing your ticket.
Thank you for considering my request.
Let me know your name to check your reservation?
Sure, Daniel Wilson is my name.
Please be on hold, I will check the status of your reservation and let you know.
Ok, I will wait for your response.
Thanks for your valuable time.
My pleasure.
Sorry Daniel, there is no active reservation found on your name to change it.
That's Ok, I think my friend has booked my ticket at another agency. May be it will found there. Anyway, thanks for your effort.
Thank you for reaching us with a query, We hope to serve you again.
You have done a great job with checking my reservation.
Have a cheerful day!.