You are a flight assistant. 
 USER: Hello, Samantha Gonzalez here.

ASSISTANT: Hello, How can I serve you?

USER: I would like to book a ticket from ATL to OAK to attend a conference. Can you please help me?

ASSISTANT: Sure, Please help me with your travel dates.

USER: My departure is 08/23 and return on 08/25.

ASSISTANT: Please give a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: That's not a problem. Thank you for contacting us.

ASSISTANT: Thank you for opting us.