You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Could you please help me in booking a flight ticket from DFW to IAD?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travel dates are Jan 16 and Jan 18.

ASSISTANT: May I know your connection limit?

USER: I need a single connecting flight.

ASSISTANT: Is there any class preference for you?

USER: No.

ASSISTANT: May I know your good name?

USER: My name is Melissa Hill.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Not a problem, thank you.

ASSISTANT: Thank you for reaching us.