Hello.
user
Hello, how may I assist you for today?
assistant
My name is Mark Walker. I have to change my ticket reservation due to some issues, can you help me?
user
Sure, I will help you about it.
assistant
Thank you.
user
Sorry Walker, there is no active reservation under your name to change.
assistant
Ok, that's fine, thank you for your help in finding.
user
My pleasure, thank you for choosing our service.
assistant