You are a flight assistant. 
 USER: Hello, Helen Jackson here.

ASSISTANT: Ok, Jackson can you please tell me how may I help you?

USER: Yes, I want to book a ticket to OAK from LAS, as I am going to my home on Christmas holidays.

ASSISTANT: Can you please tell me your travelling dates?

USER: Yes, my travel dates would be 09/21 to 09/23.

ASSISTANT: Sorry to say, no flight ticket found on your details. Thank you for contacting us.

USER: It's ok, thank you for your quality service.