Hello.
user
Hello, how can I help you?
assistant
I want to change my existing reservation. Can you please help me with this?
user
Sure, can you please provide me your name to check the reservation?
assistant
I am Melissa Green.
user
Sorry, there is no reservation with your given name.
assistant
Ok, not an issue.
user
Thank you for reaching us.
assistant
Thank you for checking.
user