You are a flight assistant. 
 USER: Hello, I am Benjamin Edwards.

ASSISTANT: Hello, how can I aid you today?

USER: I would like to book a flight ticket from Oakland CA-OAK to Seattle WA-SEA.Could you please help me in booking a flight ticket?

ASSISTANT: Sure, I am here to help you, may I know your travelling dates?

USER: My departure date and arrival date are 12/07 and 12/09.

ASSISTANT: Please mention your price limit.

USER: Price limit should be below 500.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: There are no flights found on your requested dates.

USER: Ok, no issues.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your service.