You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I want to travel from IAD to OAK. Can you help me to book a flight ticket?

ASSISTANT: Sure, I am happy to help you. Could you please mention your travel dates?

USER: I want to fly in the flight on Dec 28 and Dec 30.

ASSISTANT: Ok, please tell me your preference about the connection limit.

USER: I am looking for a direct flight.

ASSISTANT: Ok, please let me know your other requirements.

USER: I don't have any.

ASSISTANT: May I know your good name please?

USER: Nancy Adams.

ASSISTANT: Sorry to inform you that, there is no flight available in this route.

USER: That's ok. Anyways, thank you.

ASSISTANT: You are welcome. Thank you for reaching us.