You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me to book flight ticket from SFO to DFW?

ASSISTANT: Sure, may I know your trip dates?

USER: My trip dates are Apr 22 and Apr 24.

ASSISTANT: Is there any connection limit?

USER: I prefer a connecting flight.

ASSISTANT: Do you have any specifications?

USER: I prefer to travel in business class.

ASSISTANT: May I know your name?

USER: I am Samantha White.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.