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

ASSISTANT: Hello Ruth. How may I assist you at this moment?

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

ASSISTANT: Sure, I will help you with that. Please wait a moment to check your previous reservation.

USER: Nice to hear that, I will wait for your response.

ASSISTANT: We regret to inform you that, there is no reservation on your name in our records.

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

ASSISTANT: Thank you for approaching us, hope you have a great day.