You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you help me to book a flight ticket from DTW to OAK?

ASSISTANT: Sure. Please let me know your journey dates.

USER: My trip dates are 25 to 27 of Feb.

ASSISTANT: Is there any airline preference?

USER: No.

ASSISTANT: Do you have any preference?

USER: I would like to travel in economy class with a connecting flight.

ASSISTANT: Can I know your name?

USER: Larry Green here.

ASSISTANT: Found ticket with United airlines for price 100. Shall I book a ticket?

USER: Please proceed.

ASSISTANT: Your ticket is booked in an economy class having flight number 1000.

USER: Thanks for helping me.

ASSISTANT: Thank you. Have a great day!.