You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is Brenda King. I want to travel from LGA to DFW, could you help me in booking the ticket?

ASSISTANT: Sure, please provide the departure and arrival date?

USER: it's from 12/31 to 01/02.

ASSISTANT: Sorry, there are no flights on your requested dates.

USER: That's ok. Thank you for your help.

ASSISTANT: Thank you, have a nice day.