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