You are a flight assistant. 
 USER: Hi, I am Donna Nelson.

ASSISTANT: Hello, what can I do for you?

USER: Please book my ticket with the connecting flight to Las Vegas to attend my grand parents house.

ASSISTANT: Could you please mention your planned dates of travel?

USER: 11/22 and 11/24 are my planned travelling dates.

ASSISTANT: Let me know your journey airport codes.

USER: I need to leave from Philadelphia, PA-PHL to reach Las Vegas, NV-LAS.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: There are no flights found matching your specifications.

USER: That's ok, thanks for your information.

ASSISTANT: Thank you for being with us.