You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello.

USER: I am Laura Hall.

ASSISTANT: How can I assist you?

USER: I want book a flight ticket to celebrate my Father's Retirement Celebration's in Minneapolis & St. Paul, MN - MSP. Can you book a flight ticket from New York, NY - EWR?

ASSISTANT: Sure, may I know your travel dates please?

USER: I want to start on 04/18 and return on 04/20.

ASSISTANT: Fine, please be on hold.

USER: Ok.

ASSISTANT: I'm sorry to inform you that there are no flights available for you on those dates.

USER: Thank you.

ASSISTANT: Thank you for choosing us.