You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am planning to book a ticket from SFO to DCA. Can you please help me out?

ASSISTANT: Sure, may I know the planned travel dates?

USER: I am planning to travel on Nov 25 and return back on Nov 27.

ASSISTANT: Please provide me the specifications.

USER: I am looking for a business class.

ASSISTANT: May I know the name?

USER: My name is Eric Allen.

ASSISTANT: Sorry, there are no flights are available for your desired intent.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for reaching us.