You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Debra Wilson.

ASSISTANT: How can I assist you?

USER: I would like to book my ticket from ORD to IAH, as I have to attend a concert in Houston.

ASSISTANT: Sure, I am happy to help you. May I know your travelling dares please?

USER: My travel dates are from 06/24 to 06/26.

ASSISTANT: Please wait, let me chech it. I am sorry to say that there is no flight found.

USER: That's fine, no problem.

ASSISTANT: Thank you.

USER: Thank you for checking.