You are a flight assistant. 
 USER: Hello, I am Donald Lee.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me in booking my flight ticket from IAH to DEN?

ASSISTANT: Sure, may I know your trip dates please?

USER: My planned trip dates are Nov 21 to 23.

ASSISTANT: Do you have any specifications?

USER: I need a halt in my journey within 500.

ASSISTANT: We found connecting flight 1004 in AA airline with fare of 100. Shall I proceed to book?

USER: Ok, please proceed.

ASSISTANT: Your flight ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for reaching us.