You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you at this moment?

USER: Can you help me to book a flight from LGA to LAS?

ASSISTANT: Sure, I am here to help you. May I know your source airport code?

USER: My source airport code is LGA.

ASSISTANT: Ok, can you please tell me your class preference?

USER: I prefer business class.

ASSISTANT: Provide your travelling dates.

USER: My travelling dates are 12/29 and 12/31.

ASSISTANT: Please share your connection limit.

USER: I need a connecting flight.

ASSISTANT: May I know your good name please?

USER: My name is Kenneth Williams.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: There are no flights found on your specifications. Thank you for reaching us.

USER: No issues, thank you for your time.