You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you aid me in booking a flight ticket from DEN to PHL?

ASSISTANT: Sure, can I know your travelling dates?

USER: I am planning to start on Dec 18th and return back on Dec 20th.

ASSISTANT: On which name should I reserve the flight ticket?

USER: Amanda Nelson.

ASSISTANT: Do you have any connection limit?

USER: Make sure that connection limit is 1.

ASSISTANT: Do you have any other specifications?

USER: I want to depart in evening time.

ASSISTANT: Sorry, there are no flights found on given dates.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for reaching us.