You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: I planned to visit Denver Zoo with my friends, But plan got postpone. Can you do the changes in my reservation?

ASSISTANT: Sure, please let me know the new reservation details?

USER: My airport codes are EWR-DEN. Dates are 08/12 and 08/14.

ASSISTANT: Ok, shall I know your name please?

USER: My name is Katherine Thompson.

ASSISTANT: Sorry to inform you that there were no flight found under your name.

USER: No problem, Thank you.

ASSISTANT: Thank you for availing with us. Have a good day.