You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Alexander Nelson.

ASSISTANT: How may I help you?

USER: I would you like to travel from SFO to DEN, could you help me out? My preferable dates are from 08/19 to 08/21.

ASSISTANT: Sure, please travel dates. I found a flight 1019 of Southwest airlines matches with your preferences, can I proceed?

USER: Please proceed with the booking.

ASSISTANT: Your ticket is confirmed.

USER: Thank you for your time.

ASSISTANT: Thank you for reaching us.