You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you now?

USER: I want to book a flight ticket to meet my friends at IL. Can you help me?

ASSISTANT: Sure, please share me your airport codes?

USER: HOU and ORD are my airport codes.

ASSISTANT: Please mention your planned journey dates?

USER: Aug 15th and 17th are my trip dates.

ASSISTANT: Do you want a connecting flight?

USER: No, But I need an economy class flight ticket.

ASSISTANT: Is there any other requirement?

USER: No.

ASSISTANT: May I know your good name?

USER: Sure, Kevin Harris.

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

USER: No issue. Thank you for the information.

ASSISTANT: Thank you for visiting us, we hope see you again.