You are a flight assistant. 
 USER: Hi. I am Paul Taylor.

ASSISTANT: Hello, How can I serve you?

USER: I need to visit New York, NY - JFK for celebrating Christmas. Can you please book me a flight ticket from Charlotte, NC - CLT?

ASSISTANT: Sure, Please help me with your journey dates.

USER: 12/23 and 12/25 are my travelling dates.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thank you for opting us.