You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help?

USER: I am Richard White. I want to book a flight ticket to New York NY-JFK, help me in booking my flight ticket from Denver CO-DEN.

ASSISTANT: Sure, It is my pleasure to help you.

USER: Thank you.

ASSISTANT: Please share your travel dates.

USER: My travelling dates will be 12/27 to 12/29.

ASSISTANT: Do you have any price limit?

USER: My price limit is 500.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: We don't have any flights on the dates provided by you.

USER: No issues, thank you.

ASSISTANT: I am sorry for that, thank you for contacting us.