You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I want to celebrate my birthday at OAK. Can you please book a flight from DFW?

ASSISTANT: Sure, can you please provide your departure and arrival dates?

USER: Sure, I want to travel on Mar 7 and intend to return on Mar 9.

ASSISTANT: Are you looking for any preferred connections?

USER: Yes, I need a connecting flight.

ASSISTANT: Do you have any other specifications to be met?

USER: I prefer an normal-cost airline to travel.

ASSISTANT: Let me know your name to proceed further?

USER: Samantha Martinez here.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.