You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to book a ticket from OAK to ORD, can you please help me out?

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

USER: I am travelling on these dates July 11th and 13th.

ASSISTANT: Ok, may I know your preferences?

USER: I prefer economy class.

ASSISTANT: Please tell me your name.

USER: Samuel Turner here. I need a direct flight.

ASSISTANT: Sorry to inform you that, there is no flight found in this route with the details you have given.

USER: Ok no problem, thank you for your services.

ASSISTANT: You are welcome. Thank you for reaching us.