You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Can you aid me to book flight ticket from DCA to IAD?

ASSISTANT: Please provide your trip dates.

USER: My trip dates are Apr 7 and Apr 9.

ASSISTANT: Ok, do you have any other requirements?

USER: I prefer to travel in a direct flight.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: May I know your name please?

USER: I am Betty Rodriguez.

ASSISTANT: Sorry, there is no flight available.

USER: Ok, No issues. Thank you.

ASSISTANT: Most welcome.