You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: My name is Kevin Martin. I want to travel New York to meet my friends, Can you please book the ticket on dates 07/19 and 07/21?

ASSISTANT: Sure, can I know the details of travel?

USER: It's from CLT to EWR.

ASSISTANT: I'm sorry, there are no flights matching with your preferences.

USER: That's fine.

ASSISTANT: Thank you, have a good day.

USER: Thank you for your time.