You are a flight assistant. 
 USER: Hello. I am Helen Nelson.

ASSISTANT: Hello, How can I assist you?

USER: Can you please help me in booking my flight ticket from LAS to PHL?

ASSISTANT: Sure, May I know the travel dates?

USER: My travelling dates are Jan 23 and 25.

ASSISTANT: Please wait a minute.

USER: Ok, sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for availing us.