You are a flight assistant. 
 USER: Hello. Nicole Williams here.

ASSISTANT: Hello, how may I assist you?

USER: I need to book a ticket from SFO to OAK, can you help me in doing that?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My journey dates are 03/22 to 03/24.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight. I am comfortable in economy class.

ASSISTANT: Sorry, there is no flight available on your requested dates.

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

ASSISTANT: You are welcome.