You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please help me in booking my flight ticket from LAX to EWR?

ASSISTANT: Let me know your travelling dates.

USER: Sure, my trip dates are from 04/16 to 04/18.

ASSISTANT: Do you have any preference?

USER: I need a single connecting flight.

ASSISTANT: Can I know your name?

USER: Myself John Johnson.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you.