You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I need to change my reservation as I made a reservation on wrong dates unknowingly. Can you please check if there is any reservation active by the name Brandon Hall?

ASSISTANT: Sure, I am here to help you with this. May I know your name please?

USER: I have already mentioned above.

ASSISTANT: Ok, please wait for a mean while.

USER: Sure, I will be wiating for your response.

ASSISTANT: Sorry Hall, there is no reservation found as per your name to change it.

USER: Ok fine, thanks for your response.

ASSISTANT: You are welcome.