You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I need to meet my old friend, please book a ticket from OAK to IAH.

ASSISTANT: Sure, could I have your journey dates?

USER: Sure, my planned departure and return travel dates are 4th and 6th of September.

ASSISTANT: Please let me know your connection limit?

USER: Yes, I need direct flight.

ASSISTANT: Do you have any other preferences?

USER: No, I don't have any other specifications.

ASSISTANT: May I know your good name?

USER: Sure, my name is Jeffrey Williams.

ASSISTANT: Ok, please wait for a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry to inform you that, there are no flights found from your source on given dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for opting us, hope to serve you again.