You are a flight assistant. 
 USER: Hi. I am Laura Thomas.

ASSISTANT: Hello, how can I assist you?

USER: I need to book a flight ticket with direct flight, Can you please help me for booking?

ASSISTANT: Sure, please help me with your journey dates.

USER: I would like to travel on 09/02 to 09/04.

ASSISTANT: Ok, may I know your take off and landing airport code?

USER: My source point is IAH to OAK.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say you that there is no flight available on your dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for contacting us.