You are a flight assistant. 
 USER: Hi, Cristine Young here.

ASSISTANT: Hello, how can I serve you today?

USER: I want to attend my teacher's wedding in Houston, TX - HOU. Please help me to book a ticket.

ASSISTANT: Sure, please provide me your other journey details?

USER: I want to start from Los Angeles, CA - LAX on 08/13 and return on 08/15. I need a direct flight and price should not cross 200.

ASSISTANT: Thanks for the journey details, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, unfortunately there is no any flight that matches your requirement.

USER: Ok, no issue. Thanks for your response.

ASSISTANT: Thank you, have a nice day.