You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: Myself Paul Mitchell. Can you please book a flight ticket from DCA to LGA? As I have to attend a cultural fest in New York city.

ASSISTANT: Sure, I will help you in booking the ticket.

USER: Ok.

ASSISTANT: May I know your travelling dates please?

USER: Sure, I need to travel on dates of 02/15 and 02/17.

ASSISTANT: Ok, please wait for a while.

USER: Ok, I will wait.

ASSISTANT: Sorry, there are no flights found in our database.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.