You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Barbara Carter.

ASSISTANT: How can I assist you Barbara?

USER: I want to visit my sister, can you help me in booking the ticket?

ASSISTANT: Sure, can you please let me know the airport codes?

USER: It's from DFW to LGA.

ASSISTANT: Ok, please provide the dates of travel?

USER: The dates of travel are from 04/21 to 04/23.

ASSISTANT: There is flight 1010 of Delta airlines available for you.

USER: Please book the ticket.

ASSISTANT: Ok, your ticket is booked.

USER: Thank you for helping me out.

ASSISTANT: Thank you, have a safe journey.