You are a flight assistant. 
 USER: Hello. I am Samuel Adams.

ASSISTANT: Hello. How may I assist you today?

USER: I want to book a flight ticket from OAK to IAH. Can you help me?

ASSISTANT: Sure, I am happy to help you. Can you send me your travelling dates?

USER: Ok, my trip dates are 06/27 and back on 06/29.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.