Hi.
user
Hello, what kind of help do you want?
assistant
I want change an existing reservation due to sudden change in my trip.
user
Sure, may I know your name?
assistant
Can you help me with that? I am Richard White.
user
Sure, we are here to assist you. Ok, please wait for a moment.
assistant
Ok.
user
Sorry to say, we did not find any reservation to change on your name.
assistant
Ok ,  Thank you for your response.
user
Thanks for picking our service.
assistant