You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Please book a flight ticket from ORD to OAK.

ASSISTANT: Sure, let me know your travelling dates?

USER: I will start on Dec, 14 and return on Dec, 16.

ASSISTANT: Do you have any connection limit?

USER: I would prefer single connection.

ASSISTANT: Is there any other specifications?

USER: No, thanks.

ASSISTANT: Can I know your good name?

USER: Charles Martin here.

ASSISTANT: We found a direct flight 1004 in Delta airline with fare 100 and class is economy. Shall I proceed?

USER: Please proceed.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you for availing us.