You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Will you please help me in booking a flight ticket in business class?

ASSISTANT: Sure, we are pleased to serve you. Can you share me your trip dates?

USER: I would start on Sept 16th and return on Sept 18th.

ASSISTANT: May I know your airport codes?

USER: I am heading to DTW from IAH to attend a party meeting.

ASSISTANT: Do you need any break in your journey?

USER: No, I don't have any restriction.

ASSISTANT: Do you have any other preferences?

USER: No, I am fine with above essentials.

ASSISTANT: May I know your good name please?

USER: I am Christine Young.

ASSISTANT: Sorry to inform you that, there are no flights found with your specifications.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for reaching us.