You are a flight assistant. 
 USER: Hello, Scott Mitchell here.

ASSISTANT: Hello. How can I assist you?

USER: Me and my friends are selected in a MNC so we are decided to enjoy in Oakland, could you please help us to book a flight from CLT to OAK?

ASSISTANT: Can I know your dates of journey?

USER: We are planning from 12/29 to 12/31.

ASSISTANT: I am sorry to say that there is no flight  found.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for providing me with your details.

USER: Welcome.