You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Charles Allen. I would like to travel from IAH to DEN, could you help me out?

ASSISTANT: Sure, please share your travel dates.

USER: My preferable dates are from 04/21 to 04/23.

ASSISTANT: I found a flight 1001 of Southwest airlines matches with your preferences, can I proceed?

USER: Please proceed with the booking.

ASSISTANT: Your ticket is confirmed.

USER: Thank you, have a good day.

ASSISTANT: Thank you for reaching us.