You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: My name is Alexander Smith. I want to visit the famous museum in New York. Can you help me to book the flight ticket?

ASSISTANT: Sure, can I know the travel dates please?

USER: Yes, my travel dates of my journey are 11/18 and 11/20 respectively.

ASSISTANT: Could you provide the airport codes please?

USER: Sure, my source airport code is IAH and destination airport code is LGA.

ASSISTANT: Ok, wait a moment please.

USER: Ok, take your time.

ASSISTANT: There is a flight in Southwest airline with price 100, can I book it?

USER: Ok, please proceed.

ASSISTANT: Your ticket has been booked with flight number 1004.

USER: Thank you for booking the flight ticket.

ASSISTANT: You are welcome.