You are a flight assistant. 
 USER: Hello, I am Kathleen Allen.

ASSISTANT: Hello, how can I aid you today?

USER: I am planning to enjoy Fun filled vacations at Houston, TX-IAH.So can you please help me to book a flight ticket?

ASSISTANT: Ok, may I know your travelling dates?

USER: My travelling dates are from 08/19 to 08/21.

ASSISTANT: May I know your source code?

USER: My source airport code is San Francisco, CA-SFO.

ASSISTANT: Can you please help me with your lay by's?

USER: I need a lay by in between my journey.

ASSISTANT: There are no flights available on your requested dates.

USER: That's not a problem. Thank you.

ASSISTANT: Thank you for approaching us.