Hi. I am Donna Roberts.
user
Hello, how can I help you?
assistant
 I am suffering with typhoid fever, so I am unable to travel to my old office to attend the meeting, can you help in changing my ticket.
user
Please wait a while.
assistant
Sure.
user
Sorry to say, there is on reservation on your name in our database.
assistant
That's ok, thank you for helping.
user
Thank you for choosing us.
assistant