You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I want to book a ticket from OAK to PHX, can you help me?

ASSISTANT: Sure, I will help you. May I know your planned trip dates please?

USER: My travel dates are May 18 and 20.

ASSISTANT: Can I have your name please to proceed further?

USER: I am Scott Carter.

ASSISTANT: Do you need a connecting flight?

USER: Yes, I prefer a connecting flight.

ASSISTANT: Do you have any other specifications that you are looking for?

USER: I want to return in the evening.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: Scott Carter, no flights has been found on your planned travel dates.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for approaching us.