You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I want to attend my business meeting at New York, could you book my ticket from Dallas?

ASSISTANT: Sure, can you share your trip dates?

USER: My itinerary dates are June 11 and June 13.

ASSISTANT: May I know your name?

USER: Debra King here.

ASSISTANT: Can you provide your airport codes?

USER: My genesis and terminus airport codes are DFW and LGA.

ASSISTANT: Do you have any specifications?

USER: I prefer to travel in business class.

ASSISTANT: Sorry, there is no flight on your given specifications.

USER: No problem, I will find an alternative way to travel.

ASSISTANT: Thank you for reaching us.

USER: Thank you for assisting me.