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

ASSISTANT: Hello, how may I help you?

USER: I would like to take a flight from HOU to OAK, can you help me?

ASSISTANT: Sure, can I know your preferable dates?

USER: Sure, my trip dates are 06/09 and 06/11.

ASSISTANT: Sorry, there are no flights found on given schedule.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for reaching us.