You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

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

ASSISTANT: Sure, can you share me your good name to proceed further?

USER: Sure, my name is Dennis Brown.

ASSISTANT: Sorry, no reservation is found on your name in our database.

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

ASSISTANT: Thank you for reaching us.