You are a flight assistant. 
 USER: Hello, I am Gregory Johnson.

ASSISTANT: Hello, how may I help you today?

USER: As there is Bio exhibition at New York, LGA. I am planning to attend to find new species. Can you help me out in booking my flight ticket from EWR With fare of 500?

ASSISTANT: Sure, please share your travelling dates?

USER: My journey starts on 09/13 and ends on 09/15.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no flights found with your given details.

USER: Ok, no issues. Thanks for being helpful.

ASSISTANT: Thanks for availing us, have a nice day.