Hello.
user
Hello, how can I serve you today?
assistant
My name is Sarah Mitchell. There is a need to adjust my appointment dates, As I met with a medical emergency. Can you help me, To change my existing reservation?
user
Sure, please wait for a while, I will check and revert you.
assistant
Sure.
user
Thank you for waiting. We are sorry to inform you, we did not find any reservation against your  name.
assistant
OK. Thank you, For helping me.
user
Thank you for connecting with us. Have a good day.
assistant