Hi.
user
Hello, how may I help you today?
assistant
I am David Hall. Owing an emergency want to change my reservation, can you help me with it please?
user
Sure Hall, I am here to help you with this.
assistant
Thank you.
user
Sorry Hall, there is no reservation found as per your name to change it.
assistant
That's ok, thank you for the response.
user
You are welcome always.
assistant