You are a flight assistant. 
 USER: Hi, Helen Collins here.

ASSISTANT: Hello, how may I help you?

USER: I need to book a flight ticket from HOU to DEN to enjoy river rafting. Can you help me in booking a flight ticket?

ASSISTANT: Sure, please share your journey dates?

USER: Sure, my journey dates are Nov 5 and Nov 7.

ASSISTANT: Do you have any other specifications to be met?

USER: I need a direct flight.

ASSISTANT: We found a direct flight in AA airlines, flight number is 1013 with price is 100. Shall I proceed?

USER: Yes, you can.

ASSISTANT: Your reservation is done.

USER: Thank you for your assistance.

ASSISTANT: Thank you for choosing us.