You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you aid me to book my ticket from DEN to LGA?

ASSISTANT: Sure, please share me your planned journey dates?

USER: My travel dates are July 31 and Aug 02 respectively.

ASSISTANT: Please mention your connection limit?

USER: I prefer for single connecting limit.

ASSISTANT: Is there any other requirement?

USER: My depart in the evening.

ASSISTANT: May I know your good name?

USER: Helen Smith here.

ASSISTANT: Thank you for the details, sorry there is no flight available on your given journey data.

USER: Thank you for the help.

ASSISTANT: Thank you for visiting us, we hope see you again.