You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: Emily Gonzalez here. Please help me in booking flight ticket from OAK to ORD. Can you help me in that?

ASSISTANT: Sure, can you please provide your journey dates?

USER: I have planned to travel on Dec 21 to Dec 23.

ASSISTANT: Do you have any other specifications to be met?

USER: My return time is afternoon.

ASSISTANT: Are you looking for any preferred class?

USER: No.

ASSISTANT: Do you need any preferred connections?

USER: I need a connecting flight.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your valuable time, sorry no flights available on that route.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.