You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Kevin Brown, could you please help me to book a ticket from PHX to EWR?

ASSISTANT: Sure, on which dates you are planning to travel?

USER: My trip dates are on Oct 23 and Oct 25.

ASSISTANT: Can you please tell me if you have any other requirements?

USER: I need to depart at evening.

ASSISTANT: Sorry, there is no flights available.

USER: Ok, thank you for response.

ASSISTANT: Most welcome.