You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I have heard that Oakland is the best place for site seeing, So I want to visit Oakland, CA - OAK on Aug/29. Can you help me in booking my ticket?

ASSISTANT: Sure, may I know your source and return date?

USER: Yes, My source is from Houston, TX - HOU and returning on Aug/31.

ASSISTANT: Ok, please wait a while. I will check and revert you.

USER: Ok.

ASSISTANT: Thanks for your time. There is no flight found with your request.

USER: Ok, No problem.

ASSISTANT: May I know your name please?

USER: I am Benjamin Thompson.

ASSISTANT: Ok.

USER: Thank you for your response.

ASSISTANT: Thank you and have a great day.