You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Sure, please mention your name for checking the reservation.

USER: Sure, my name is Sarah Jackson.

ASSISTANT: There are no reservation found under your name.

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

ASSISTANT: Welcome, have a great day.