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, I am here to assist you. Please help me with your name.

USER: Sure, my name is Charles Jones.

ASSISTANT: Thank you. Please wait, let me check your reservation status in our database.

USER: Ok, take your time.

ASSISTANT: Sorry, I did not find any reservation under your name in our database.

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

ASSISTANT: You are welcome and thank you for choosing us.