You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am planning to book a ticket from OAK to DFW. Can you please help me out?

ASSISTANT: Yes, can you share me your dates of travel?

USER: I am planning to travel on Sept 17 and return back on Sept 19.

ASSISTANT: Do you have any other preferences?

USER: I am looking for a direct flight and I am looking for a normal cost airline.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: That's fine, thank you for your service.

ASSISTANT: Can I know your name?

USER: My name is Kimberly Carter.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your service.