You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, may I know your name please?

USER: Sure, my name is Kimberly Miller.

ASSISTANT: Wait a while, kindly.

USER: Ok, I will wait for your response.

ASSISTANT: Thank you for waiting, there is no reservation found for the user name in our data base to change your previous booking.

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

ASSISTANT: Thank you for opting us.