You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your name please?

USER: My name is Amy Hall.

ASSISTANT: Ok Amy, how may I assist you?

USER: I planned on visiting New York for my birthday, so I want to travel from LAS to EWR.

ASSISTANT: Ok Amy, so would you like me to book a ticket for you?

USER: Yes, can you please help me out?

ASSISTANT: Yes, I will help you. Can you please tell me your dates of travel?

USER: I would like to depart on 12/21 and return back on 12/23.

ASSISTANT: Ok, please hold on for a moment and I will get back to you with the available flight details.

USER: Sure, take your time.

ASSISTANT: Sorry, there are no flights available which matches with your requirements.

USER: That's ok. Thank you for your time.

ASSISTANT: Thank you, have a nice day.