You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Please book a flight ticket from ORD to OAK.

ASSISTANT: Sure, may I know your travel dates?

USER: My travel dates are May 04 and May 06.

ASSISTANT: Please share me your name.

USER: My name is Christopher Williams.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: Sorry, there is no flight at this moment.

USER: Ok, thank you.

ASSISTANT: Thank you.