You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

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

USER: I am travelling on these dates May 27th and 29th.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I prefer departure in the evening.

ASSISTANT: May I know your connection limit?

USER: I need a single connected flight.

ASSISTANT: Is there any class preference for you?

USER: I don't have any other preferences.

ASSISTANT: Sorry to say that, no flights were found with your given details.

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

ASSISTANT: Thank you for reaching us.