You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Larry Taylor here.

ASSISTANT: How may I guide you?

USER: Please book my ticket in a direct flight.

ASSISTANT: Sure, may I know your nearest airport codes?

USER: My airport codes are SEA and OAK.

ASSISTANT: Can I have your journey dates please?

USER: My trip dates are 11/16 and 11/18.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Larry, no flights has been found on your journey dates.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.