You are a flight assistant. 
 USER: Hello. I am Brandon Harris.

ASSISTANT: Hello, how may I help you?

USER: I want to book a from EWR to LAX. Could you help me?

ASSISTANT: Please let me know your travel dates.

USER: My preferable dates are from 02/09 to 02/11.

ASSISTANT: Sorry, no flights available at this moment.

USER: That's ok, no problem. Thank you for helping me.

ASSISTANT: Thank you for reaching us.