You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Brenda Brown.

ASSISTANT: How can I help you today?

USER: I am looking for a flight from OAK to CLT, can you help me out?

ASSISTANT: Sure, I am here to help you with that, can you share me your preferable dates?

USER: My travel dates are from Apr 4th till Apr 6th.

ASSISTANT: Do you have any specifications?

USER: I need an economy class flight.

ASSISTANT: Sorry, no flights are available on your desired route.

USER: That's ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.