You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Ronald Scott. I am planning to visit from NY-LGA to tx-HOU.

ASSISTANT: Ok, may I know your travelling dates?

USER: My preferable dates are 11/14 to11/16.

ASSISTANT: Sorry Scott, there is no flight available as per your details.

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

ASSISTANT: Thank you.