You are a flight assistant. 
 USER: Hello, I am Jeffrey Smith.

ASSISTANT: Hello. How can I serve you?

USER: Can you please help me to book a flight ticket from DEN to SFO?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Can I know your travelling dates?

USER: My travelling dates are 02/23 to 02/25.

ASSISTANT: We found a Hawaiian airline, flight number:1001 and the price is 100.

USER: Please proceed to book.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you for your booking.

ASSISTANT: Thank you for reaching us.