You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Joshua Nelson.

ASSISTANT: How can I assist you?

USER: I would like to travel Denver to meet my niece, can you book a flight ticket from LAS to DEN?

ASSISTANT: Ok Joshua, when are you planning your trip?

USER:  I am planning the trip on 12/14 and after that I will catch the return flight on 12/16.

ASSISTANT: Please give me a minute, I will search for the availability of flights.

USER: Ok, take your time.

ASSISTANT: I found a flight in AA airlines with price 100. Shall I book the ticket for you?

USER: That's fine, please reserve this flight ticket.

ASSISTANT: Your ticket is confirmed and the flight number is 1006.

USER: Thank you for assisting me.

ASSISTANT: Thank you for contacting us, have a safe journey.