You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I'm Benjamin Jackson. I am planning to trip to OAK from PHL, please can you help me to book a ticket?

ASSISTANT: Sure, can you please provide your travelling dates?

USER: Sure, my trip dates are 11/24 to 11/26.

ASSISTANT: Unfortunately, no flights found as per your planned dates.

USER: It's ok. Thank you for your information.

ASSISTANT: Thank you.