You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you for the day?

USER: I am Nancy Smith. Can you please help me in booking a ticket from OAK to SFO?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: When you are willing to travel?

USER: My travel dates are from June 7th to June 9th.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Please wait for a moment.

USER: I need to depart at afternoon.

ASSISTANT: Sure. Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Than you for reaching us.