You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Emily Evans, want to travel from HOU to ORD. Please help me in booking my ticket.

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, my travelling dates are from 04/23 to 04/25.

ASSISTANT: Sorry, there is no flight available as per your request.

USER: It's ok, thank you.

ASSISTANT: Most welcome.