You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Sandra Williams.

ASSISTANT: How can I assist you?

USER: Can you help me in booking from PHL to EWR?

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: Can I know your travel dates?

USER: My travelling dates are 12/12 to 12/14.

ASSISTANT: Sandra, there is no flight available on your requested dates.

USER: No issue, thank you.

ASSISTANT: You are welcome.