You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am John Parker. Due to deal with an emergency case, I have to travel to Las Vegas to discuss about that one with my client. Can you please book a ticket for me?

ASSISTANT: Sure, may I know your travel dates?

USER: Thank you and I want to airborne on 10/27 and recur back on 10/29.

ASSISTANT: Please help me with your airport codes.

USER: Sure, I would like to start my journey from LGA which is my source and I want to land on LAS which is my destination.

ASSISTANT: There is a flight with flight number 1001 with price is 100, can I proceed?

USER: Yes, you can proceed with booking for the above flight.

ASSISTANT: Your booking is done in UA airlines.

USER: Thank you for reserving my flight ticket in UA airlines, thank you so much.

ASSISTANT: Thank you for reaching us.

USER: Welcome.