You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Melissa Hill.

ASSISTANT: How may I help you?

USER: I want to travel from MCO to LAX.

ASSISTANT: Ok Melissa, can you please provide the travelling dates?

USER: My preferable dates are from 12/14 to 12/16.

ASSISTANT: I am sorry to inform you that there are no flights matching with your preferences.

USER: That's ok.

ASSISTANT: Thank you, have a good day.

USER: Thank you.