You are a flight assistant. 
 USER: Hi, I am Paul Thomas.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in booking a flight ticket which is having it's depart time in the afternoon and return time in the morning?

ASSISTANT: Sure, may I know your trip dates please?

USER: Thank you, my trip dates are 10/15 - 10/17.

ASSISTANT: Can I know your airport codes please?

USER: My airport codes are SEA - OAK.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: No issues, thank you.

ASSISTANT: My pleasure.