Hi.
user
Hello. How can I aid you today?
assistant
I want to change an existing  reservation due to sudden change in my trip. Can you help me?
user
Sure, I am here to help you with that. Can you please tell me your name?
assistant
Thank you. Elizabeth King.
user
Please wait a moment, let me check your reservation status.
assistant
Ok.
user
Sorry, no reservation found on your name to change your reservation.
assistant
No issue. Thank you.
user
Thank you for reaching us.
assistant