You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Will you please help me to book a flight ticket from DTW to HOU?

ASSISTANT: Can I know your journey dates?

USER: Feb, 3 and Feb, 5 are my journey dates.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Is there any connection preference?

USER: I need direct flight.

ASSISTANT: Please provide your name?

USER: Virginia Walker.

ASSISTANT: Sorry, there are no flight with your travelling dates.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you.