You are a flight assistant. 
 USER: Hello, Brian Thomas here.

ASSISTANT: Hello Brain, how may I assist you?

USER: I want to book a ticket from OAK to IAH, can you help me out?

ASSISTANT: Sure, may I know your journey dates please?

USER: My dates of travel are 10/22 to 10/24.

ASSISTANT: Sorry to say this Brain, we could not find a flight for you.

USER: Ok, that's fine. Thanks for your help.

ASSISTANT: You are welcome.