You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nicholas Collins.

ASSISTANT: How may I assist you today?

USER: Yes, I am trying to reserve a flight ticket from PHX to EWR. Can you please help me?

ASSISTANT: Sure, may I know your planned trip dates?

USER: My planned trip dates are 04/07 and 04/09.

ASSISTANT: Sorry to inform you, there are no flights found with the details you have given to me.

USER: It's ok, thank you for searching the flight.

ASSISTANT: You are welcome. Thank you for reaching us.