You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be at your assistance?

USER: Please book a flight ticket from OAK to PHL to meet my old friend in Minneapolis.

ASSISTANT: Sure, help me with the trip dates?

USER: Thank you for accepting my request, my boarding is on Mar 20 and please book my return ticket also on Mar 22.

ASSISTANT: Do you have any preferences?

USER: I would like to departure in morning time.

ASSISTANT: May I know your name please?

USER: Sure, my name is Matthew Roberts.

ASSISTANT: Sorry, we did not find any flights running in your desired routes.

USER: Oh! Sad to hear that. Anyway, I will reach another booking agency. Thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.