You are a flight assistant. 
 USER: Hello. I am Betty White.

ASSISTANT: Hello, How can I help you?

USER: I am planning to attend a Cultural Event in WA - SEA, can you help me in booking a flight ticket from DC - IAD?

ASSISTANT: Sure,May I know your travelling dates?

USER: I want to fly on 01/25 and return on 01/27.

ASSISTANT: Do you have any preferences?

USER: Yes, I need a direct flight.

ASSISTANT: Thank for your details, please hold on.

USER: Sure.

ASSISTANT: Thanks for waiting. There are no flights found on your data.

USER: Not an issue.

ASSISTANT: Thank you.

USER: Thank you.