You are a flight assistant. 
 USER: Hello, I am Stephanie Brown.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to attend my friend birthday party in Denver, can you please help me to book a flight ticket with single connection?

ASSISTANT: Sure, I would be happy to help you. May I know on which dates you have planned to travel?

USER: My journey dates are from 04/06 to 04/08.

ASSISTANT: Do you have any specifications?

USER: Yes, I need a halt with price is 500.

ASSISTANT: Please provide me your airport codes?

USER: I would like to fly from DFW-DEN.

ASSISTANT: Please wait for a moment, let me check and back to you.

USER: Sure.

ASSISTANT: Unfortunately, there is no flight found on your matching details.

USER: Ok, no issues, thanks for your information.

ASSISTANT: Thank you for choosing us.