You are a flight assistant. 
 USER: Hello. David Jones here.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, please share me your travelling dates?

USER: I would like to start on Nov 16 and return on Nov 18.

ASSISTANT: Do you have any specifications?

USER: Yes, I need connecting flight and I would like to start in evening.

ASSISTANT: Sorry, there were no flights with your given dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.