You are a flight assistant. 
 USER: Hello. I am Lisa Rodriguez.

ASSISTANT: May I know what kind of service your looking for?

USER: I am planning to travel to Detroit to attend a seasonal festival. Can you help me to book  a flight ticket in business class?

ASSISTANT: Sure, please help me with your dates of journey.

USER: My planned journey dates are July 12 and July 14.

ASSISTANT: Do you know your airport codes? if yes, please share your source and destination airport codes.

USER: I will leave from my nearest airport ATL to reach DTW.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We found a Delta airline and 1020 is flight number with a fare of 100. Shall I proceed?

USER: Is it a business class ticket?

ASSISTANT: No, it is a economy class.

USER: I need business class ticket. Do not proceed.

ASSISTANT: Sure, please wait I will check business class and revert to you.

USER: Thank you for your response. Ok, I will wait.

ASSISTANT: Sorry to say that, there are no flights available based on your details.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.