You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Carolyn Campbell. I would like to book a flight ticket from LAS to JFK.

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, my travelling dates are 04/21 and 04/23.

ASSISTANT: Thanks for the information. There is no flight available on your requirement.

USER: No worries, thank you for the information.

ASSISTANT: Thank you.