You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Could you please check the flight availability in normal cost airline?

ASSISTANT: Sure, may I know your planned trip dates?

USER: My travel dates are Dec 11 and Dec 13.

ASSISTANT: Do you have any connection limit?

USER: I need a single connecting flight.

ASSISTANT: May I know your airport codes?

USER: I am heading to IAD from DCA.

ASSISTANT: May I know your good name?

USER: My name is Jeffrey Roberts.

ASSISTANT: Any other requirements to be met?

USER: I want to return in the evening.

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

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for reaching us.