You are a flight assistant. 
 USER: Hello, I am Kimberly Nelson.

ASSISTANT: Hello, How can I help you?

USER: Can you help me in booking a flight ticket from TX - DFW to CO - DEN?

ASSISTANT: Sure, I will help you. May I know your travelling dates?

USER: I want to fly on 08/14 and return on 08/16.

ASSISTANT: Do you have any preferences?

USER: I need a direct flight.

ASSISTANT: Thanks for your details. There are no flights found on your data.

USER: Not an issue. Thank you.

ASSISTANT: Thank you.