You are a flight assistant. 
 USER: Hi, Samantha Lewis here.

ASSISTANT: Hello, how can I assist you?

USER: I want to change an existing reservation done on my name due to the sudden venue change of our board of directors meeting owing to the high hailstorm in our previous venue.

ASSISTANT: Sure. Please wait a moment.

USER: Ok, take your time.

ASSISTANT: Unfortunately, We did not found any reservation on your name.

USER: Ok, no problem and thanks for your information.

ASSISTANT: Thanks for contacting us.