You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My name is Karen Moore. I am planning to travel from JFK to DCA for a business trip. Can you please help me with booking a flight ticket?

ASSISTANT: Sure, can you provide your journey dates?

USER: Sure, my departure date is on 12/10 and the return date is on 12/12.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry Karen, there is no flight available with your details.

USER: That's really sad. Anyways, thank you for the information.

ASSISTANT: You are welcome.