You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please book me a ticket from CLT to JFK?

ASSISTANT: Let me know your travel dates.

USER: I am planning my journey on the dates of Apr 12 and Apr 14.

ASSISTANT: Do you have any preference?

USER: No.

ASSISTANT: Can I know your name?

USER: My name is Frank Hernandez.

ASSISTANT: Direct flight is found with airline Delta for price 100.

USER: That's ok. Please reserve my ticket in this flight.

ASSISTANT: Ticket is booked having flight number 1019.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you.