You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am Carolyn Walker. I would like to book a ticket from ORD to HOU, can you help me?

ASSISTANT: May I know your travelling dates?

USER: My travel dates are 11/23 and 11/25.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say, no flight is available for you.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for reaching us, have a nice day.