You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Dennis Lopez here. Can you help me to book a connecting flight from JFK to DEN?

ASSISTANT: Sure, let me know your travelling dates.

USER: My travelling dates are 21 Oct and 23 Oct.

ASSISTANT: Please share your connection limit.

USER: I need a connecting flight.

ASSISTANT: Can you please share your specifications?

USER: My return time should be in the evening.

ASSISTANT: We found an UA airlines with single connection and your return time will be evening. Shall I proceed?

USER: Please proceed.

ASSISTANT: Your ticket has been confirmed with 1027 flight number.

USER: Thanks for helping me.

ASSISTANT: Thank you.