You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kimberly Collins.

ASSISTANT: How may I assist you today?

USER: I would like to book a ticket from ORD and I like to return in the afternoon from DFW.

ASSISTANT: Sure, may I know your travelling dates?

USER: Can you help me with booking?

ASSISTANT: Sure.

USER: Ok, my journey dates are from Aug 23 to 25.

ASSISTANT: Sorry, there are no flights available on your journey dates.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for reaching our service.