You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am Janet Williams want to visit HOU, can you book a ticket from IAD?

ASSISTANT: Sure, I will help you with that. Can I have your travel dates please?

USER: Sure, my travelling dates will be 03/07 and 03/09.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry Janet Williams, no flight is available to you on your dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us, have a good day.