You are a flight assistant. 
 USER: Hello. I am Andrew Hill.

ASSISTANT: Hello, how may I help you?

USER: I am looking for a flight from EWR to LAS, can you help me in booking the flight ticket please?

ASSISTANT: Ok, please tell me your trip dates.

USER: My trip dates are from 04/08 till  04/30.

ASSISTANT: Hall, there is no plane as per your planned travel dates.

USER: That's ok, no problem. Thank you for your response.

ASSISTANT: Thank you for consulting us, have a great day.