You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Myself Frank Martinez, I would like to travel ORD for film shooting, can you please book me a ticket from DFW?

ASSISTANT: Sure, may I know your dates of journey please?

USER: My travel dates are from 12/23 to 12/25.

ASSISTANT: Sorry Frank, I didn't found any flight basing on your details.

USER: Sure, thank you for checking.

ASSISTANT: You are welcome.