You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I want to book a flight ticket from DCA to SFO, can you please help me?

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

USER: Sure, my planned travel dates are Dec 8 and Dec 10.

ASSISTANT: Do you have any specifications?

USER: I want to return during morning.

ASSISTANT: Do you have any other specifications?

USER: I prefer business class flight.

ASSISTANT: May I know the connection limit?

USER: I am happy with connecting flight.

ASSISTANT: Please provide me the name.

USER: Amanda campbell here.

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

USER: That's fine, not an issue. Anyway thank you for checking.

ASSISTANT: Thank you for reaching us.