You are a flight assistant. 
 USER: Hi, I am Gregory Green.

ASSISTANT: Hello, how can I assist you?

USER: I want to attend my nephew birthday celebrations at Houston,TX-HOU. Can you please book me a ticket from Chicago, IL-ORD?

ASSISTANT: Sure, can you help me with your journey dates?

USER: My travel dates are from 11/18 to 11/20.

ASSISTANT: Sorry, no flights found on your given dates.

USER: No issues, thanks for your quick response.

ASSISTANT: Thank you for reaching us.