You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Barbara Campbell. Can you help me in booking the ticket from OAK to ATL?

ASSISTANT: Sure, can you please share your travel dates?

USER: My planning dates are from 03/04 to 03/06.

ASSISTANT: Let me check for the availability of flight.

USER: Ok.

ASSISTANT: Barbara, there is a flight available with price 300. Is that ok for you?

USER: Sorry, I need a flight with a price of 200.

ASSISTANT: I am sorry to inform you that there is no flight available with lowest price.

USER: That's ok. Thank you for your help.

ASSISTANT: Thank you for reaching us.