You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I'm Patrick Lewis. Can you please help me to book my ticket from DTW to IAH?

ASSISTANT: Can you please mention your dates of journey?

USER: My travelling dates are 10/09 and 10/11.

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

USER: Ok, fine I can search for any other way to travel. Thank you for your information.

ASSISTANT: You are welcome.