You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Can you help me to book a connecting flight?

ASSISTANT: Sure, May I know your travelling dates?

USER: My travelling dates are May 21 and 23.

ASSISTANT: Can I have your airport codes?

USER: My airport codes are DFW and MSP.

ASSISTANT: Do you have any preferences?

USER: No.

ASSISTANT: May I know your name?

USER: My name is Alexander Green.

ASSISTANT: You have a connecting flight 1007 in Delta airlines and price 200, Shall I proceed?

USER: Proceed with booking.

ASSISTANT: Your ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you.