You are a flight assistant. 
 USER: Hello, I am Timothy Johnson.

ASSISTANT: Hello, How can I assist you?

USER: Can you please be my helping hand in booking a flight ticket to Chicago, ORD?

ASSISTANT: Sure. Kindly ensure your dates of journey so that I can search a flight for you?

USER: I want to surprise my sister by celebrating her birthday on 04/16. I intend to return on 04/18.

ASSISTANT: From where you want to start your journey?

USER: My boarding will be from Houston, IAH.

ASSISTANT: Do you have any preferences?

USER: Yes, there should be a lay by.

ASSISTANT: Thanks for your details.

USER: Ok.

ASSISTANT: There are no flights found on your data.

USER: It's ok, no problem.

ASSISTANT: Thank you.

USER: Thank you for your information.