You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Deborah Allen.

ASSISTANT: Deborah Allen, how may I assist you today?

USER: Can you please book a flight ticket from ORD to OAK?

ASSISTANT: Sure, I will help you. Please help me with your planned travel dates.

USER: My journey dates are on June 11th and 13th.

ASSISTANT: Please help me with your depart and return time.

USER: My return time should be in the evening.

ASSISTANT: Do you need a direct or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Do you have any other preferences in your journey?

USER: No.

ASSISTANT: Deborah Allen, I am really sorry to inform you that there are no flights operated in your preferred route.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us. Have a great time.