You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Benjamin Harris.

ASSISTANT: How can I guide you?

USER: I have a business meeting in Atlanta. Can you help me for booking?

ASSISTANT: Sure, can you please share your trip dates?

USER: My travelling dates are from 06/30 till 07/02.

ASSISTANT: Ok, may I know your airport codes?

USER: My airport codes are from OAK to ATL.

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

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

ASSISTANT: Welcome.