You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Can you please help me with booking a flight ticket from OAK to DFW?

ASSISTANT: Sure, I am here to help you for this. When are you planning your trip?

USER: My travelling dates are from Sept 20-22.

ASSISTANT: May I know your name please?

USER: Joshua Phillips here.

ASSISTANT: Is there any connection limit?

USER: I would be comfortable with single stop over.

ASSISTANT: do you have any other specifications regarding your journey?

USER: No.

ASSISTANT: Sorry for inconvenience, no flights are found with your specifications.

USER: No problem, thank you for the information.

ASSISTANT: Thank you very much for approaching our agency.