You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to travel from SFO to BOS. Can you help me to book a flight ticket?

ASSISTANT: Sure, please share your journey dates?

USER: I want to fly in the flight on May 17 and May 19.

ASSISTANT: Do you have any specifications?

USER: I prefer to travel in business class.

ASSISTANT: Is there any airline preferences?

USER: No, but I am looking for a connecting flight.

ASSISTANT: May I know your good name?

USER: I am Susan Perez.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for choosing us.