You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am planning to attend music concert at IAD, can you please help me with booking a flight ticket from OAK?

ASSISTANT: May I know your travelling dates?

USER: I would like to take off on Mar 7 and return on Mar 9.

ASSISTANT: Please let me know your connection limit?

USER: I am looking for a connecting flight with business class.

ASSISTANT: May I know your name?

USER: My name is Lisa Adams.

ASSISTANT: Sorry, no flights available on your route.

USER: I would like to return during afternoon time. Can you please check with that?

ASSISTANT: Thank you for connecting with us. I have rechecked with that. No flights available with your requirements.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Most welcome.