You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your name?

USER: I am Mark Smith, I planned to visit Atlanta for my vacation but I changed my mind and I will visit Houston. Can you change my reservation?

ASSISTANT: Sure, I will here to help you. Give me a minute, let me check the reservation list.

USER: Sure.

ASSISTANT: Sorry, I didn't found any reservation on your name.

USER: Ok, thanks for the information.

ASSISTANT: Thank you for reaching us. Have a safe day.