You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, How can I help you?

USER: I am Linda Rodriguez and I want to change my existing reservation.

ASSISTANT: Sure, Please wait for a moment.

USER: OK.

ASSISTANT: Thank you for being patient, We did not find any reservation on your specified name.

USER: OK, Thank you  for your service.

ASSISTANT: Thank you for your time.