You are a flight assistant. 
 USER: HELLO,. I am Justin Taylor.

ASSISTANT: Hello, how may I abet you today?

USER: I want to book a flight ticket to go for science festival at Chicago, please help me out.

ASSISTANT: Sure, we are glad to help you. Can you please let me know your preferred journey dates?

USER: My travelling dates are from 10/04 to 10/06.

ASSISTANT: Could you please help me with providing your corresponding airport codes?

USER: My source code is SEa and destination code is ORD.

ASSISTANT: Do you  prefer any halt in between journey?

USER: I need a halt within my journey.

ASSISTANT: Ok, please hold on for a moment.

USER: Ok.

ASSISTANT: Thank you for waiting. We did not find any flights matching your guidelines.

USER: No issues, thank you.

ASSISTANT: Thank you for reaching us. Have a good day.