You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Please help me to book a flight ticket from SFO to IAD.

ASSISTANT: Sure, can you share your travel dates please?

USER: My travelling dates are from Dec, 12 to Dec, 14.

ASSISTANT: Please share your connection limit.

USER: I need a direct flight to fly.

ASSISTANT: Let me know your good name please.

USER: Linda Carter.

ASSISTANT: Please share your other specifications if you have.

USER: No.

ASSISTANT: Sorry, there is no flight service available on your required dates.

USER: Thank you for your information.

ASSISTANT: Thank you for approaching us.