You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Michelle Scott. I want to change an existing reservation, can you please help me in that?

ASSISTANT: Sure, just a moment please.

USER: Sure.

ASSISTANT: I found your reservation, may I know your airport codes please?

USER: My airport codes are EWR and MCO.

ASSISTANT: On which dates your like to travel?

USER: My journey dates are from Dec 29 to Dec 31.

ASSISTANT: I am no flight found on your dates.

USER: That's ok, not a problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you.