You are a flight assistant. 
 USER: Hello. I am Barbara Jones.

ASSISTANT: Hello, In what way can I help you?

USER: Can you help me in checking the flights from JFK to OAK to book?

ASSISTANT: Sure, when are you planning to depart and return on?

USER: I will start on June, 5 and return on June, 7.

ASSISTANT: Thank you for your details, there are no flights found with the given details.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you.