You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is Mary Jackson. I want to visit my brother in Oakland, could you help me in booking the ticket?

ASSISTANT: Sure, please provide the journey details like airport codes and journey dates?

USER: It's from CLT to OAK. The dates of travel are from 11/11 to 11/13.

ASSISTANT: Sorry, there are no flights available on you requested dates.

USER: That's ok. Thank you for your time.

ASSISTANT: Thank you, have a nice day.