You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Michelle Carter. I would like to travel from LGA to DFW, could you help me out?

ASSISTANT: Sure, can I know your travelling dates?

USER: My preferable dates are from 28-30 NOV.

ASSISTANT: Sorry, there are no flights available for given dates.

USER: That's ok. Thank you, have a good day.

ASSISTANT: Thank you for reaching us.