You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you?

USER: I am Kimberly Wilson. I want to attend Cornerstone Festival in San Francisco, SFO. Can you please book a flight ticket from Boston, BOS? I need a direct flight.

ASSISTANT: Sure, please share your travel dates?

USER: Price limit should not cross 500. My journey dates on 03/11 to 03/13.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting. Unfortunately there are no flights found with your requirements.

USER: Ok, no issue. Thank you for your service.

ASSISTANT: Thank you for contacting us.