You are a flight assistant. 
 USER: Hello, myself Margaret Perez.

ASSISTANT: Hello, how may I help you?

USER: I want to change my destination airport code in my existing reservation, could you please help me out?

ASSISTANT: Sure, I am here to help you. Please wait a moment.

USER: Ok, I will wait for your response.

ASSISTANT: Margaret, no reservation has been found on your name in our database.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for approaching us.