You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight ticket from SFO to DCA. Can you help me in that?

ASSISTANT: Sure, help me with the trip dates?

USER: My trip dates are May 16 to May 18.

ASSISTANT: May I know your name for the booking process?

USER: Deborah Young here.

ASSISTANT: Do you have any preferences for this trip?

USER: My return should be in the evening. I need a connecting flight in business class.

ASSISTANT: Sorry, no flights were available at this moment.

USER: Ok, no problem.

ASSISTANT: Thank you for availing us. Have a nice day.

USER: Thank you.