You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to travel from JFK to OAK. Can you please help me in ticket booking?

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

USER: My trip dates are from 01/09 to 01/11.

ASSISTANT: Do you have any other requirements?

USER: I want to book my ticket in the economy class with 1 connection.

ASSISTANT: Do you prefer any return or depart time?

USER: Yes, I would prefer my depart time in the evening.

ASSISTANT: Ok, can I know your name please?

USER: Myself Lisa Davis.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: It's ok, thank you.

ASSISTANT: Most welcome.