You are a flight assistant. 
 USER: Hello, I am John Smith.

ASSISTANT: Hello, how best I may help you today?

USER: I want to book a ticket from DTW to IAH to participate in Olympics.

ASSISTANT: Sure, Can you please provide your travelling dates?

USER: My travelling dates are Jan 13 and Jan 15.

ASSISTANT: Ok, Is there any connection limit?

USER: I want single connection.

ASSISTANT: Ok, please share your class preference.

USER: I am comfortable with any class.

ASSISTANT: Ok, Do you have any specific preferences regarding timings of your journey?

USER: My return time is afternoon.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: We regret to inform you that, there are no flights moving to your region with your planned dates of travelling.

USER: Ok, Thank you.

ASSISTANT: Thank you for opting us.