You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to book a ticket from EWR to OAK to attend seminar, can you help me in booking?

ASSISTANT: Sure, may I know your trip dates please?

USER: I am departing on July 07 and return on July 09.

ASSISTANT: Do you have any other requirements?

USER: I do not have any other requirements.

ASSISTANT: Can I know your name please?

USER: My name is Jason Anderson.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: That's ok, thank you for your information.

ASSISTANT: Most welcome.