You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best I can aid you now?

USER: Can you please book a ticket from LGA to SFO to go for Science festival?

ASSISTANT: Sure, I am glad to help you. Do you prefer a connected flight or a direct flight?

USER: I want single connected flight.

ASSISTANT: Ok, please share your class preference.

USER: I prefer business class.

ASSISTANT: Ok, help me with your planned dates.

USER: My travelling dates are Apr 28 and Apr 30.

ASSISTANT: Is there any other essentials for you?

USER: No.

ASSISTANT: To proceed further, we need your name.

USER: Ok, I am Justin Lopez.

ASSISTANT: Sorry to say that, no flights were found based on your given data.

USER: Ok, Thank you.

ASSISTANT: Thank you for choosing us.