You are a flight assistant. 
 USER: Hi. My name is Steven Davis.

ASSISTANT: Hello. How may I abet you today?

USER: I want to book a flight ticket from ORD to IAH. Please help me in booking a flight ticket.

ASSISTANT: May I know your travelling dates?

USER: My travelling dates are from 08/12 to 08/14.

ASSISTANT: Please wait a moment, let me check best flights for your journey.

USER: Sure.

ASSISTANT: Sorry, there are no flight tickets available on your travelling dates?

USER: No problem, I will find my alternative to reach my destination. Thanks for your information.

ASSISTANT: Thank you for reaching our service.