You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How could I serve you?

USER: Can you help me to book a flight from DFW to SEA?

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

USER: My travelling dates are Feb 22 and 24.

ASSISTANT: Do you have any other requirements?

USER: I prefer direct flight.

ASSISTANT: Can you please share me your name?

USER: My name is Stephen Walker.

ASSISTANT: Unfortunately there is no flight found with your given information.

USER: No issues, thank you for your time.

ASSISTANT: Thank you.