You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Barbara Jones, want to travel from ATL to DEN for trip. Can you please help me? Can you please help me in changing my previous airport codes to this airport codes?

ASSISTANT: Sure, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, we regret to inform you that there is no active reservation found with your name in our records.

USER: That's fine, thank you so much.

ASSISTANT: My pleasure.