You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: I am looking for a direct flight from OAK to ORD, can you help me to book a ticket?

ASSISTANT: Sure, I will help you. Can you please provide me your travel dates?

USER: Sure, my travel dates are from 09/09 to 09/11.

ASSISTANT: Ok, may I know your name please?

USER: My name is Stephanie Carter.

ASSISTANT: Please wait, let me check for the direct flights.

USER: Ok, take your time.

ASSISTANT: Sorry Carter, no flights available on your preferred dates.

USER: Ok, no problem. Thank you for your help.

ASSISTANT: Thank you for choosing us and have a nice day.