Hello. I am Barbara Lewis.
user
Hello. How may I guide you today?
assistant
Due to my health problem I want to change my reservation, can you please help me to change my reservation?
user
Sure, I will help you with that.
assistant
Thank you.
user
Please wait for a minute.
assistant
Sure.
user
I am sorry to say  that there is no reservation found under your details.
assistant
That's ok. Anyways, thank you for your help.
user
Thank you for reaching us.
assistant