You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My name is Jacob Baker, I want to book a flight from AUS to OAK to attend a meeting with client. Can you book a return flight in evening?

ASSISTANT: Please provide me your planned travel dates to proceed.

USER: I will fly on Aug 19 and return on Aug 21.

ASSISTANT: Do you prefer either economy or business class?

USER: I ok with any class.

ASSISTANT: We do not found any flights running in your preferred dates.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for opting us.