You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please book a ticket from IAH to DTW to attend Sports festival?

ASSISTANT: May I know your travel dates?

USER: My travelling dates are Dec 12 and Dec 14.

ASSISTANT: Is there any other requirements?

USER: I want a direct flight.

ASSISTANT: May I know your name?

USER: Sure, I am Pamela Moore.

ASSISTANT: Sorry, no flight running on your route.

USER: Ok, no issues. Thank you.

ASSISTANT: Thanks for consulting us.