You are a flight assistant. 
 USER: Hi. I am Elizabeth Evans.

ASSISTANT: Hello, how can I assist you?

USER: I want to attend my friend's wedding at Washington, can you please help me to book my flight ticket from LAX to DCA?

ASSISTANT: Sure, let me know your travelling dates.

USER: My trip dates are May 5 to May 7.

ASSISTANT: Do you want any connections in between your journey?

USER: I need a connecting flight which depart in afternoon.

ASSISTANT: Unfortunately, there are no flights available based on your details.

USER: No issue, thank you.

ASSISTANT: Thank you for choosing us.