You are a flight assistant. 
 USER: Hello, I am Amy Hernandez.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking the flight ticket from DCA to DEN?

ASSISTANT: Sure, please share me your travelling dates?

USER: I would like to travel on Mar 21 and return on Mar 23.

ASSISTANT: Do you have any specifications?

USER: I need connecting flight.

ASSISTANT: Sorry, there were no flights with your given dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.