You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am Richard White. Can you help me in changing my reservation?

ASSISTANT: Sure, I am happy to help you with that. Please be hold on for a moment.

USER: Ok.

ASSISTANT: Yes, I have found your reservation so please provide me your travel dates.

USER: My airport codes are SEA and ORD.

ASSISTANT: Ok, please provide me your travel dates too.

USER: My planning dates are from 03/05 to 03/07.

ASSISTANT: Please be hold on for a moment and I will inform you flight details.

USER: Ok.

ASSISTANT: Sorry Richard White, no flight is available to you on your travel dates.

USER: That's fine. Anyway, thank you for your help.

ASSISTANT: My pleasure. Thank you for choosing us, have a good day.

USER: You are welcome.