You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you aid me to book a ticket from EWR to DEN?

ASSISTANT: Can I know your travelling dates?

USER: My travelling dates are Apr 25 and Apr 27 respectively.

ASSISTANT: May I know your name please?

USER: Brenda Turner here.

ASSISTANT: Please let me know your connection limit?

USER: Make sure that connection limit is single.

ASSISTANT: Sorry, no flights available on your route.

USER: My depart and arrival time should be in the afternoon please check again.

ASSISTANT: I have rechecked but unfortunately, no flights available on your route.

USER: Thank you for the help.

ASSISTANT: Thank you for choosing us.