You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, may I know your good name?

USER: Stephen Baker.

ASSISTANT: When do you want to travel?

USER: I want to travel in the flight on Apr 26 and Apr 28.

ASSISTANT: Can I know your stopover limit?

USER: I want to have a connection of 1.

ASSISTANT: Do you have any other specifications?

USER: I prefer economy class.

ASSISTANT: Sorry, there are no flights available on your request.

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

ASSISTANT: Thank you for reaching us.