You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I give assistance to you?

USER: Jack Phillips here. I want to attend my cousin's convocation ceremony, so please book my ticket from SFO to OAK.

ASSISTANT: Surely, we will help you out. Can you please help me with your planned dates?

USER: My itinerary dates are Dec 23 and Dec 25.

ASSISTANT: Is there any class preferences?

USER: I prefer economy class.

ASSISTANT: Thanks for your details, please wait.

USER: Ok.

ASSISTANT: Thank you for waiting, no flights were found based on your schedule.

USER: No problem, I will find an alternative way to travel.

ASSISTANT: Thank you for availing us.