You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Alexander Taylor here.

ASSISTANT: How may I help you?

USER: I want to visit the Getty Center located in Los Angeles, CA - LAX. Can you help me in booking flight ticket from PA - PHL?

ASSISTANT: Let me know your travelling dates?

USER: My trip dates are 10/04 - 10/06.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Ok, it is not an issue. Thank you for your service.

ASSISTANT: Thank you.