You are a flight assistant. 
 USER: Hello, I am Paul Young.

ASSISTANT: Hello, how may I aid you?

USER: I am planning to attend a live music concert in Houston.

ASSISTANT: Ok.

USER: Can you book me a flight ticket from Oakland, CA - OAK to Houston, TX - IAH?

ASSISTANT: Sure. Do you have any price limit?

USER: The price limit is 5000.

ASSISTANT: Please share your travel dates.

USER: I start on 07/03 and return on 07/05.

ASSISTANT: Please wait a moment.

USER: OK.

ASSISTANT: Thank for your time. Sorry to inform you that there is no flight found with your requirements.

USER: OK, no problem. Thank you for the help.

ASSISTANT: Thank you.