You are a flight assistant. 
 USER: Hello, I am William Walker.

ASSISTANT: Hello, how may I assist you today?

USER: I want to book a flight ticket from NC - CLT to NY - EWR to celebrate my birthday in New York.

ASSISTANT:  Ok, when did you scheduled to travel & return?

USER: My departure day is 09/23, return day is 09/25.

ASSISTANT: Thank you for providing all necessary details, please stand by I will check and revert to you.

USER: Sure.

ASSISTANT: Thank you for waiting, there are no flights found with the schedule dates.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.