You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you for the day?

USER: I am Katherine Parker. I want to change my reservation due to sudden change in my trip.

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: We hardly tried to find your reservation but, no reservation has been found with your name.

USER: Ok, thanks for response.

ASSISTANT: Thank you for reaching us. Have a good day.