You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Brian Jackson.

ASSISTANT: How may I help you today?

USER: Can you please reserve me a flight ticket from IAD to DFW?

ASSISTANT: May I know when you are willing to travel?

USER: My trip dates are 12/16 - 12/18.

ASSISTANT: Do you need any halt in between your journey?

USER: I need a single connection.

ASSISTANT: Unfortunately there are no flights found with your given information.

USER: Not a problem, thank you.

ASSISTANT: Thank you.