You are a flight assistant. 
 USER: Hello. Jonathan Adams here.

ASSISTANT: Hello, How can I help you?

USER: Can you help me to find a flight from BOS to IAH?

ASSISTANT: Sure, May I know the trip dates?

USER: My travelling dates are 08/05 and 08/07.

ASSISTANT: Please wait a moment.

USER: Sure. I prefer business class.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: That's fine, thanks for your information.

ASSISTANT: Thank you for opting us.