You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best I can assist you at this moment?

USER: I need you to book a flight ticket from DFW to IAH. Please help me.

ASSISTANT: Sure, can you please forward your journey dates?

USER: September 3 and 5 are my planned travelling dates.

ASSISTANT: Do you prefer any stopover in between journey?

USER: Yes, I do prefer it.

ASSISTANT: May I know your name please?

USER: My name is Jonathan Green.

ASSISTANT: Do you have any other preferences?

USER: Nothing much to state.

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

USER: That's ok. Thanks for your time.

ASSISTANT: Thank you for choosing us.