You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Dennis Johnson.

ASSISTANT: How may I assist you?

USER: I want to travel from DFW to ORD. Can you book a flight ticket for me?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: I want to travel in the flight on July 11 and July 13.

ASSISTANT: Do you prefer either business or economy class?

USER: No, but I want to return in afternoon time.

ASSISTANT: May I know your connection limit please?

USER: I want to have a connection of 1.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Dennis Johnson, there are no flights available in your route.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for reaching us.