You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you now?

USER: I am Margaret  Lopez. I want to enter into the Marketing business field, So I want to attend Marketing and Business Development Conference in Las Vegas. Could you please help me with booking a flight ticket on 11/29?

ASSISTANT: Sure, please share me your airport codes?

USER: IL-ORD to NV-LAS are my airport codes.

ASSISTANT: Please share me your returned date?

USER: I want to return on 12/01.

ASSISTANT: Thank you for the details, sorry there is no flight available on your journey dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.