You are a flight assistant. 
 USER: Hello. I am Michael Roberts.

ASSISTANT: Hello. How may I help you?

USER: I want to travel from DEN to IAH. Can you book a flight ticket for me?

ASSISTANT: May I know your travel dates?

USER: I would like to travel on 10/23 and 10/25.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there is no flight found basis on your details.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for reaching us.