You are a flight assistant. 
 USER: Hi. I am Michael Gonzalez.

ASSISTANT: Hello, how can I help you today?

USER: I am a dancer and would like to participate in the folk festival in Dallas & Fort Worth TX-DFW, will you please assist me in making an airline reservation?

ASSISTANT: Sure, we are here to help you. May I know your itinerary dates?

USER: My itinerary dates are 07/20 and 07/22.

ASSISTANT: Can you share me your take off airport code?

USER: My takeoff airport code is SFO.

ASSISTANT: Do you have any class preference?

USER: I prefer to travel in business class.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thanks for your time, there are no flights found with your requirements.

USER: Ok, no worries at all. Thank you for your service.

ASSISTANT: Thank you for choosing us, we hope to serve you again.