Hi.
user
Hello.
assistant
I am Lisa Gonzalez.
user
How can I help you Lisa?
assistant
Can you help me for changing my existing reservation?
user
Sure, please wait for a moment.
assistant
Ok, I will wait for your reply.
user
 I have checked and seen that there is no reservation found under your name.
assistant
Oh! It's ok, I think my sister already changed my reservation. Thank you for your quick response.
user
Thank you for approaching us.
assistant