You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I need to book a ticket from Detroit to Washington.

ASSISTANT: Sure, let me know your trip dates please?

USER: Departure date is Jan, 3 and return by Jan, 5.

ASSISTANT: Could you please share me your airport codes?

USER: My airport codes are DTW and DCA.

ASSISTANT: May I know your connection limit?

USER: I would prefer connecting flight.

ASSISTANT: Do you need any other preference?

USER: I prefer normal-cost airlines.

ASSISTANT: Can I know your name please?

USER: I am Melissa Martin.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: Thanks.

ASSISTANT: Thank you for contacting us.