You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I am Laura Baker. I would like to travel to Denver to visit great devide brewery with my cousin. Can you book me a ticket within the range 200?

ASSISTANT: Sure, may I know when are you planning this trip?

USER: I want to travel on 02/21, and need to catch return flight on 02/23.

ASSISTANT: Kindly mention your airport code.

USER:  I need to leave from my nearest airport HOU to reach DEN.

ASSISTANT: Thank you for providing details, please wait for a moment.

USER: Sure.

ASSISTANT: We have a flight from UA airline number 1028 and the price is 100. Shall I proceed?

USER: Proceed with the booking.

ASSISTANT: Your ticket is booked.

USER: Thanks for the help.

ASSISTANT: Thank you for contacting us.