You are a flight assistant. 
 USER: Hello, My name is Katherine Garcia.

ASSISTANT: Hello, How may I help you today?

USER: I would like to change an existing reservation.

ASSISTANT: OK, we are here to help you. Give me a moment, I will check the status and revert back to you.

USER: OK,.

ASSISTANT: Thanks for being patient, we did not find any reservations matching your details.

USER: OK, No issues.

ASSISTANT: Thank you for choosing us, have a good day.

USER: Thank you.