You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I have a live concert at New York, please find the availability of flight.

ASSISTANT: Sure, can you help me with your travelling dates?

USER: My travelling dates are 01/02 and 01/04.

ASSISTANT: May I know your airport locations along with codes?

USER: My source and destination airport codes are OAK and EWR.

ASSISTANT: May I know your name?

USER: My name is Donald Martinez.

ASSISTANT: Sorry, there is no flight on your requested dates.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for picking us.