You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I would like to change my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: Sure, myself Katherine Jones.

ASSISTANT: Please allow me a moment.

USER: Sure, I will wait for your response.

ASSISTANT: There is no reservation found under your name.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for contacting us.