You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello, how can I assist you?

USER: I am Deborah Thompson. I want to book a flight ticket from CO-DEN to NC-CLT. Can you help me?

ASSISTANT: Sure, let me know your travelling dates.

USER: 12/18 and 12/20 are my travelling dates.

ASSISTANT: Do you have any requirements?

USER: I need a flight ticket within 500.

ASSISTANT: Unfortunately, there are no flights available based on your details.

USER: No issue. Thank you.

ASSISTANT: Thank you for choosing us.