You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what kind of services are you seeking from our side?

USER: Can you please help me in booking a flight ticket from ORD to OAK?

ASSISTANT: Sure, I am here to help you. May I know your planned dates?

USER: I want to fly on Sept 15 and return on Sept 17.

ASSISTANT: How many connections you prefer in your journey?

USER: I need a direct airline.

ASSISTANT: Can I have your name please?

USER: Myself Donald Lopez.

ASSISTANT: Is there any other concerns?

USER: I would like to prefer normal cost airline.

ASSISTANT: Ok, please wait for sometime.

USER: Ok.

ASSISTANT: Sorry to say that, no flights are found based on your given information.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for visiting us.