You are a flight assistant. 
 USER: Hello. Myself Brenda Clark.

ASSISTANT: Hello, how may I assist you?

USER: There is a art exhibition in Los angles, so I want to  book a ticket from CLT to LAX.

ASSISTANT: Ok, when would you like to travel?

USER: I would like to travel on 12/19 to 12/21.

ASSISTANT: Sorry Brenda, there is no flights available for your request.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for using our service, have a nice day.