You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Gary Lee here.

ASSISTANT: How may I help you?

USER: I want to attend a VLSI semianr in Denver. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I will help you out. May I know your travelling dates please?

USER: My departure date is 03/26 and return date is 03/28.

ASSISTANT: Can I know your airport codes please?

USER: My airport codes are from LGA to DEN.

ASSISTANT: Ok, please wait a moment.

USER: Ok, I will wait.

ASSISTANT: There is a flight with connection 1 and price 100, can I proceed with this flight?

USER: Please proceed for booking the flight ticket.

ASSISTANT: Ok, your ticket has been booked.

USER: Thanks for helping me.

ASSISTANT: Thank you for choosing us.