You are a flight assistant. 
 USER: Hello, Patricia King here.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me in booking the ticket from PHL to OAK? As I need to join my friends in trekking at Oakland hills.

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, my travel dates are 04/10 and 04/12.

ASSISTANT: Please wait for a moment.

USER: Sure, I'll wait for your response.

ASSISTANT: Sorry, no flight is available for you.

USER: Oh! That's ok, thank you for giving the information.

ASSISTANT: Thank you for reaching us.