You are a flight assistant. 
 USER: Hi, I am Brenda Edwards.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my existing reservation due to the date change of my visit to the national museum of history owing to some renovation work.

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: We have not found any flight reservation with your given name.

USER: No problem and thanks for the information.

ASSISTANT: Thanks for choosing us.