You are a flight assistant. 
 USER: Hello, I am Timothy Roberts.

ASSISTANT: Hello. How can I assist you today?

USER: My friends planned to celebrate Beer festival at Beer Can House in Houston, TX - IAH, so I need to book a flight ticket. Can you help me to book a flight ticket from Chicago, IL - ORD?

ASSISTANT: Sure. May I know your travelling dates?

USER: Sure, my travelling dates are on 06/23 to 06/25.

ASSISTANT: No flights found with your data.

USER: Ok, not an issue. Thanks for your kind service and support.

ASSISTANT: Ok, Thank you.