You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I need to book a ticket from SFO to IAD, can you help me?

ASSISTANT: Sure, can you share your trip dates?

USER: My travel dates are 07/19 and 07/21.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Are there any other specifications?

USER: Nothing more.

ASSISTANT: Please forward your name.

USER: I am Anthony Jackson.

ASSISTANT: Sorry, there are no flights found on your specified trip dates.

USER: That's ok. Thank you for your service.

ASSISTANT: Thank you for availing us.