You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: I want to book a ticket from PHL to DCA.

ASSISTANT: Sure, when are you planning to make your trip?

USER: Travelling dates are from Dec, 1 to Dec, 3.

ASSISTANT: Do you need a lay by?

USER: I need a direct flight.

ASSISTANT: May I know your name?

USER: My name is Rachel Hernandez.

ASSISTANT:  Thank you for sharing your details. We did not find any flights matching your credentials.

USER: Thanks.

ASSISTANT: Thank you fro opting us.