You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you with today?

USER: I want to attend the birthday party.Can you please help me in booking the ticket?

ASSISTANT: Sure, I can help you with that. Can you please help me with the source and the destination airport codes?

USER: Sure, my codes are from NY-JFK to CO-DEN.

ASSISTANT: Could you please provide your travelling dates?

USER: My travelling dates are 06/01 to 06/03.

ASSISTANT: Thank you for the information. May I know your name to proceed further?

USER: My name is Matthew Lewis.

ASSISTANT: Matthew, I am sorry to inform you that there is no flight available at your requested dates.

USER: Ok, thank you for your information.

ASSISTANT: You are welcome. Thank you for contacting us.