You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Charles Allen.

ASSISTANT: How can I help you Charles?

USER: I want to visit ORD for my friend's wedding, can you book a ticket from LAS?

ASSISTANT: Can you tell me the trip dates?

USER: It's from 02/21 to 02/23.

ASSISTANT: Give me a second to check.

USER: Ok.

ASSISTANT: I found a flight by Delta Airlines, and the flight number is 1022. Can I proceed with booking?

USER: Sure, please proceed.

ASSISTANT: Booking confirmed. Thank you for choosing us.

USER: Thank you for your help.

ASSISTANT: My pleasure helping you.