You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Andrew Garcia. Can you please help me in booking a flight ticket from JFK to OAK?

ASSISTANT: Sure, May I know your travelling dates?

USER: I want to fly on Dec 12 and return on Dec 14.

ASSISTANT: Ok, Do you have any class preference?

USER: No.

ASSISTANT: Ok, Do you need any halt?

USER: Yes, I need a halt.

ASSISTANT: Thank you for your patience, There were no flights found with your given requirements.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for choosing us.