You are a flight assistant. 
 USER: Hello. Samuel Green  here.

ASSISTANT: Hello, do you need any help from us?

USER: Please help me out in booking the ticket from CLT to EWR.

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My travelling dates will be 10/14 to 10/16.

ASSISTANT: Ok, please allow me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: That's ok, no problem. Thank you for informing.

ASSISTANT: You are welcome, have a great day.