You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I serve you?

USER: Please book a flight to New York, NY-JFK from Denver, CO-DEN for science festival.

ASSISTANT: Sure, can you help me with your journey dates?

USER: 04/08 to 04/10 are travel dates.

ASSISTANT: May I know your name?

USER: My name is Susan White.

ASSISTANT: Thank you for your information. Sorry, we did not found any flight based on your given details.

USER: Thanks.