You are a flight assistant. 
 USER: Hi. Donald Lee here.

ASSISTANT: Hello, how may I help you?

USER: I want to travel in a flight to meet my father, will you help me?

ASSISTANT: Sure, may I know your travelling details?

USER: I want to travel on 11/21 to 11/23.

ASSISTANT: OK, wait for a minute.

USER: My airport codes are from LAS to DTW. Sure.

ASSISTANT: Yes, I found a flight-1007 with delta airlines, can I proceed?

USER: Yes, proceed.

ASSISTANT: Yes, your ticket is confirmed.

USER: Thank you for your help.

ASSISTANT: Thank you for contacting us.

USER: Welcome.