You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Rebecca Davis. I would like to travel from DEN to OAK, could you help me out?

ASSISTANT: Sure, please share your travel dates.

USER: My preferable dates are from 03/05 to 03/07.

ASSISTANT: Sorry, no flights available at this moment.

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

ASSISTANT: Thank you for reaching us.