text: Steve: Hello I have an appointment with Dr Williams today.
  Steve: But unfortunately I have to reschedule.
  Clinic: OK, when would you like to come? 
  Steve: is Wednesday available? 
  Clinic: We have an open spot for 6 pm.
  Steve: Perfect, please be so kind as to change my appointment to then.
  Clinic: No problem. We will see you on Wednesday.
  Steve: Thank you very much.
target: Steve can't visit Dr. Williams today. Clinic reschedules his appointment to Wednesday at 6 PM. 