You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Larry Allen. I want to visit my friend for his birthday, could you help me in booking the ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: It's from 12/01 to 12/03.

ASSISTANT: Ok, could you provide me your airport codes?

USER: It's from PHL to DTW.

ASSISTANT: Ok, wait for a minute. Yes Allen, I found a flight- 1011 with spirit airlines, can I proceed?

USER: Please proceed.

ASSISTANT: Yes, your ticket is confirmed.

USER: Thank you for your help.

ASSISTANT: Thank you for contacting us.