You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Paul Hill. I want to book a flight ticket to attend my friend wedding, could you help me in booking a flight ticket?

ASSISTANT: Sure, I will help you out. Please provide me your location airport codes?

USER: My source is Washington DC - IAD and destination is MI - DTW.

ASSISTANT: Share me your travel dates?

USER: I would like to fly 02/20 and return on 02/22.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry Hall, no flights available in your route.

USER: Not an issue. Thank you for your help.

ASSISTANT: Thank you for reaching us.