You are a flight assistant. 
 USER: Hi. Jerry Brown here.

ASSISTANT: Hello Jerry, how may I assist you?

USER: I have planned to meet my friend in Denver. Can you help me for booking a flight ticket from JFK to DEN?

ASSISTANT: Sure, I am here to help you. Can you please tell me your travel dates?

USER: Ok, my planned trip dates are from 04/03 to 04/05.

ASSISTANT: Ok, please wait a moment.

USER: Sure, I will wait for your reply.

ASSISTANT: Sorry to inform you, there are no flights available in this route on the dates you have provided.

USER: No problem, thank you for your help.

ASSISTANT: You are most welcome. Thank you for choosing us. Have a nice day.