Hi.
user
Hello, how can I help you?
assistant
I am Alexander Moore, can you help me for changing an existing reservation?
user
Sure, please wait for a while. I will get back to you.
assistant
Ok, I will wait for your response.
user
I have searched for your reservation, there is no reservation found under your name in our database.
assistant
Oh! I think my sister already changed my reservation. Thank you for your services.
user
Thank you for choosing our service.
assistant