You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you aid me to book a ticket from DTW to CLT?

ASSISTANT: Let me know your travelling dates.

USER: My travel dates are Oct 27 and Oct 29 respectively.

ASSISTANT: Is there any airline preference?

USER: No airline preferences for me.

ASSISTANT: Do you have any preference?

USER: Make sure that connection limit is single. I prefer to travel in economy class.

ASSISTANT: Can I know your name?

USER: Gregory Roberts here.

ASSISTANT: Direct flight is found with airline Delta for price 100.

USER: Ok.

ASSISTANT: Ticket is booked having flight number 1004.

USER: Thank you.

ASSISTANT: Thank you.