You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Andrew Lewis. I am planning to book a ticket to visit my family at DTW. Can you please help me out to book a ticket for me?

ASSISTANT: Help me by giving your trip dates so that I can help you easily.

USER: I would like to travel on 12/22 and return back on 12/24.

ASSISTANT: Can I have your current location?

USER: My source code is  HOU.

ASSISTANT: Sorry, there is no flight found with your provided travelling dates.

USER: That's fine.

ASSISTANT: Thanks for contacting us.

USER: Thank you for your service.