You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Gregory Lewis. I am planning to book a ticket with 1 connection. Can you please help me out?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: I would like to travel on 05/25 and return back on 05/27.

ASSISTANT: Can you share me your location airport codes?

USER: My airport codes are AUS to OAK.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry Lewis, there is no flights in your route.

USER: That's fine. Thank you for your help.

ASSISTANT: Thank you for reaching us.