You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I have to go on a trip with my friend. Can you please book a flight from DCA to IAD?

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

USER: I will be off to IAD on 09/11 and head back on 09/13.

ASSISTANT: Do you need a halt in between your journey?

USER: Sure, one connection is fine.

ASSISTANT: May I know your good name?

USER: My name is Kevin Allen.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Not a problem, thank you for checking it.

ASSISTANT: Thank you for reaching us.