You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you help me in booking a flight ticket from PHL to IAD?

ASSISTANT: Sure, could you mention your travel dates?

USER: I want to travel on 07/13, and return on 07/15.

ASSISTANT: May I know your airline preference?

USER: I prefer for normal cost airline.

ASSISTANT: Do you need any other requirements in your journey?

USER: I need a direct flight.

ASSISTANT: Ok, may I know your name please?

USER: I am Gary Perez.

ASSISTANT: Sorry, no flights found on that route.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for contacting us.