You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brandon Wright.

ASSISTANT: How can I  help you?

USER: I would like to travel from ORD to DEN. Can you please help me to book a ticket?

ASSISTANT: Your travelling dates please?

USER: My travelling dates will be on Sept 27 to Sept 29.

ASSISTANT: I am sorry no flights found on your route.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for choosing us.