Hi.
Hello,.
I am Frank Hall.
How can I help you today?
Owing an emergency want to change my reservation, so can you help  me with it please?
Sure, I will help you with that.
Thank you.
Please wait a while.
Ok, take your time.
Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.
That's ok. Thank you for the response.
Thank you for approaching us.