You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I want to travel from DCA to SEA. Can you help me to book a flight ticket?

ASSISTANT: Sure, I am perky to help you. On what dates, you have planned to travel?

USER: I want to travel in the flight on Apr 02 and Apr 04.

ASSISTANT: How many connections you require in your journey?

USER: I am looking for a direct flight.

ASSISTANT: May I know your name please?

USER: David Turner.

ASSISTANT: Is there any other concerns to say?

USER: I prefer normal-cost airline.

ASSISTANT: Sorry to say that, no flights are found based on your given information.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for opting us.