You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Myself Frank Hall, can you help me to change the flight ticket which I had done a week ago to visit the art gallery?

ASSISTANT: Sure, please allow me a moment.

USER: Ok, please take the time you need.

ASSISTANT: Sorry, there is no reservation matching with your name to make changes.

USER: That is not a problem. Thank you for assisting me.

ASSISTANT: You are welcome.