You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. Can you please let me know what service that you are looking for?

USER: I am Carolyn campbell, can you help me to book a flight on 11/30 and 12/02?

ASSISTANT: Yes, I can help you with that. Do you have any idea on the airport codes? If yes, please provide me the codes.

USER: My preferable location airport codes are IAD and BOS.

ASSISTANT: Ok, please give me a minute to check the flight availability.

USER: Ok.

ASSISTANT: Sorry to inform you, there are no flights available on the dates you have provided.

USER: No issues, thank you for your help.

ASSISTANT: You are welcome. Once you have changed your travel dates, please contact us. Then we will provide you the flight. Anyways thank you for reaching us.