You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Can you help me to book a flight from DEN to JFK?

ASSISTANT: Sure, please provide your travelling dates.

USER: My travelling dates are Mar 19 and 21.

ASSISTANT: Ok, May I know your connection limit?

USER: I prefer connecting flight.

ASSISTANT: Ok, Do you have any class preference?

USER: No. I want to return at morning.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for your time, No flights were found with your given details.

USER: No issues.

ASSISTANT: May I know your good name?

USER: My name is Sarah Harris. Thank you for your information.

ASSISTANT: Thank you for choosing us.