You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you please reserve my flight ticket from EWR to DEN?

ASSISTANT: Sure, please share your journey dates?

USER: My travelling dates are Sept 4th and Sept 6th.

ASSISTANT: Do you have any specifications?

USER: I am looking for a single connection.

ASSISTANT: Is there any class preferences?

USER: No.

ASSISTANT: May I know your good name?

USER: Kathleen Clark.

ASSISTANT: Sorry, no flights found on your given details.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you for choosing us.