You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please book a flight ticket from DFW to DEN?

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: Thank you. I have planned my travel dates as Sept 30 and Oct 02.

ASSISTANT: Do you require any stopovers in your journey?

USER: I am looking for single connecting flight so please check with that.

ASSISTANT:   Would you let us know if you have any other preferences?

USER: No, I do not have any more specifications.

ASSISTANT: Please share your name.

USER: Sure, myself William Moore.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thanks for reaching us.

USER: Most welcome.