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 flight from SFO to OAK?

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

USER: Sure, I want to travel on Dec 24 and need to return on Dec 26.

ASSISTANT: Ok, could I have your name please?

USER: Myself Deborah Smith.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Ok, do you have any other specifications?

USER: No.

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

USER: Ok, not an issue. Thank you for checking.

ASSISTANT: You are welcome, have a great day.