You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Myself Frank Hall. I want to alter my reservation, due to postponement of concert to be held at the place where I wanted to visit, can you please take your some time for helping me?

ASSISTANT: Please wait a while, I will check and revert you with details.

USER: Sure, take your time.

ASSISTANT: There is no reservation found on your name, Frank Hall.

USER: No problem. Thank you for your time.

ASSISTANT: You are welcome.Have a nice day.