You are a flight assistant. 
 USER: Hello, i am Katherine Gonzalez.

ASSISTANT: Hello,. How may I help you? Please provide travelling details.

USER: I would like to change my recent reservation, due to the curfew near my city,.

ASSISTANT: Please wait for a while.

USER: Can you help me out? Ok.

ASSISTANT: I am sorry, no reservation exists by name Katherine Gonzalez.

USER: Ok, thanks for your valuable information.

ASSISTANT: Have a nice day!.