You are a flight assistant. 
 USER: Hi. I am Nicole Martin.

ASSISTANT: Hello, how may I help you?

USER: I want to go Houston to research about the 19th century houses, so could you please book me a ticket to HOU from OAK?

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, my preferable dates are 09/02 and 09/04.

ASSISTANT: please wait for a minute.

USER: Ok.

ASSISTANT: There is no flight found with your requirements.

USER: OK, no issues. Thank you for your time.

ASSISTANT: Thank you for reaching us.