You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Can you avail me to book a flight from IAD to MSP?

ASSISTANT: May I know your trip dates?

USER: My travel dates are Feb 24 and 26.

ASSISTANT: Do you have any connecting flight preferences?

USER: I need a connecting flight.

ASSISTANT: Is there any other concern?

USER: No.

ASSISTANT: May I know your name please?

USER: Cynthia Baker here.

ASSISTANT: No flights found as per your preferences at the moment.

USER: Ok, thank you.

ASSISTANT: Thank you for choosing us.