You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Eric Wilson here.

ASSISTANT: How may I assist you?

USER: Can you book a flight ticket for my airport codes that is from ATL to ORD?

ASSISTANT: Yes, can you share me your travelling dates?

USER: The travel dates are from Sept 12 to Sept 14.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Not a problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you.