You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to book the flight ticket from OAK to BOS. Can you please help me?

ASSISTANT: Sure, can you please provide me your name?

USER: My name is Daniel Hall.

ASSISTANT: Thank you. Please let me know your travel dates.

USER: My travel dates are AUG 30 and SEPT 1.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: I am sorry to inform you that there is no flight available on your preferred travel dates.

USER: Thank you for the information.

ASSISTANT: You are welcome and thank you so much for contacting us.