You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: Can you please help me in booking my ticket?

ASSISTANT: Sure, please provide your travel dates?

USER: I want to start my journey on 03/25 and my return date is 03/27.

ASSISTANT: Can I know your airport codes?

USER: I want to start my journey from ATL and my destination code is ORD.

ASSISTANT: May I know your name please?

USER: Myself Elizabeth Parker.

ASSISTANT: Sorry there is no flight basing on your details.

USER: OK, fine.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your information.