Hello, I am Robert Wilson.
user
Hello, how can I serve you now?
assistant
I would like to change my existing reservation, because I did not get concert tickets. Could you please help me?
user
Sure, we are mirthful to help you.
assistant
Thank you.
user
Thank you for being patience. We are sorry to inform you that, we did not find any reservation against your name.
assistant
Ok, not an issue. Thank you for your information.
user
Thank you for reaching us.
assistant