You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Jason Wilson. I want to attend a meeting in Houston. Can you book a ticket from ORD to IAH?

ASSISTANT: May I know your desired travel dates please?

USER: I want to travel on 01/13 and 01/15.

ASSISTANT: There is no flight on your desired travel dates.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for opting us.