You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Can you please help me to book a direct flight to reach Philadelphia?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: Sure, my planned dates are on Oct 10th to 12th.

ASSISTANT: Ok, may I know your origin location airport code?

USER: Sure, It is Seattle, SEA.

ASSISTANT: Ok, do you have any other specifications?

USER: I would like to return in afternoon time in business class.

ASSISTANT: Ok, could I have your name please?

USER: Sure, my name is Jacob Collins.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: No issues, thank you.

ASSISTANT: You are welcome, have a great day.