You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you today?

USER: I would like to book a flight ticket from SFO, can you please help me in booking a flight ticket to ORD?

ASSISTANT: Sure, could you please mention with your dates of journey?

USER: My trip dates are Apr 11th and Apr 13th.

ASSISTANT: May I know your name please?

USER: Amy Young.

ASSISTANT: Are you looking for any other help from my side please?

USER: I will prefer to travel in business class. I need a connecting flight.

ASSISTANT: Ok, wait for a mean while please.

USER: Sure.

ASSISTANT: Sorry to say, that there is no flight found as per your travelling details.

USER: Ok, thank you.

ASSISTANT: You are welcome.