You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Larry Wilson.

ASSISTANT: How can I help you today?

USER: I have a plan to meet my friend in Oakland, can you help me for booking a flight ticket?

ASSISTANT: Sure, I will help you in booking. Can you please share your travel dates?

USER: My travelling dates are from 09/02 till 09/04.

ASSISTANT: Ok, may I know your airport codes?

USER: My travelling airport codes are from DTW to OAK.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a nice day.