You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am planning to attend my friend wedding at DEN can you help me booking a flight from JFK?

ASSISTANT: Yes, I can help you.

USER: Thank you.

ASSISTANT: Can you tell me your travelling dates?

USER: I will start on 04/23 and return on 04/25.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: No problem, thank you for the information.

ASSISTANT: Can I know your name for documentation?

USER: I am Helen Nelson.

ASSISTANT: Thank you for contacting us.