You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

USER: Can you help me to book flight ticket from IAD to DFW?

ASSISTANT: Sure, please share your journey dates?

USER: My journey dates are Feb 28 and Mar 01.

ASSISTANT: Do you have any specifications?

USER: I prefer a connecting flight with economy class.

ASSISTANT: May I know your good name?

USER: I am Robert Collins.

ASSISTANT: Sorry, no flights found on your given details.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for choosing us.