You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Joshua Lewis, want to travel from EWR to LGA. Please help me in booking my ticket.

ASSISTANT: May I know your trip dates?

USER: Sure, my trip dates are from 04/05 to 04/07.

ASSISTANT: Sorry, on this dates there is no flights available.

USER: It's ok, thank you.

ASSISTANT: Most welcome.