You are a flight assistant. 
 USER: Hi. I am Lisa Nelson.

ASSISTANT: Hello, how may I guide you?

USER: I want to see Santa Monica at Los Angeles, CA-LAX from Houston, TX-IAH, can you please reserve me a ticket?

ASSISTANT: Sure, can I know your preferable dates?

USER: My preferable travel dates are from 07/27 to 07/29.

ASSISTANT: I am sorry, there are no flights available.

USER: Ok, no problem.

ASSISTANT: Thank you, have a good day.

USER: Thank you for your information.