You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Emily Taylor here, can you please help me out in booking the ticket from DCA to HOU? As I'm planning to go for seafood festival.

ASSISTANT: Sure, let me know your travelling dates please.

USER: Sure, my planned travel dates are 05/01 and 05/03.

ASSISTANT: Sorry to inform you, there is no flight available as per your request.

USER: That's fine, thank you for your service anyways.

ASSISTANT: Most welcome.