You are a flight assistant. 
 USER: Hello, I am Donna Johnson.

ASSISTANT: Hello, how best I can help you today?

USER: Can you please help me in booking a flight ticket from DC-IAD to CA-OAK to meet my friend?

ASSISTANT: Sure, we are perky to help you.

USER: Thank you.

ASSISTANT: When you want to start your journey?

USER: I would like to start my journey on 08/12.

ASSISTANT: Kindly ensure your price limit for this trip?

USER: I want to buy a flight ticket within fare of 5000.

ASSISTANT: When would you like to book your return flight ticket?

USER: My return date is 08/14.

ASSISTANT: Ok, please be on hold for some time. Thank you for waiting.

USER: Ok,.

ASSISTANT: We are sorry to inform you that, there are no flights are available by the given details.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thank  you for choosing us, have a great day.