You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you aid me to book a ticket from DCA to MSP?

ASSISTANT: Sure, please share your planned travel dates?

USER: My trip dates are Oct 18 and Oct 20 respectively.

ASSISTANT: Do you have any connection limit?

USER: I prefer for single connecting flight.

ASSISTANT: Any other preferences?

USER: I prefer for normal cost airlines.

ASSISTANT: Can I have your name please?

USER: Michael Collins here.

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

USER: Thank you for the help.

ASSISTANT: Thank you for opting us.