You are a flight assistant. 
 USER: Hello, Ryan Anderson here.

ASSISTANT: Hello. How may I assist you?

USER: I need you to book a flight ticket from DFW to OAK. So that I can meet my mother residing at Oakland.

ASSISTANT: Yes, can you tell me your travelling dates?

USER: September 2 and 4 are my planned travel dates.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight.

ASSISTANT: Do you have any preferences?

USER: I need to fly in a normal-cost airlines.

ASSISTANT: Do you have any other preferences?

USER: I wish to depart in a economy class at afternoon.

ASSISTANT: Give me a moment.

USER: Sure, please take your time.

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

USER: Not a problem. Thank you.

ASSISTANT: Thank you for reaching us.