You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be at your service today?

USER: I would like to travel from DFW to OAK as a business trip, can you do the reservation?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My journey dates are Mar 25th and Mar 27th.

ASSISTANT: Do you have any other specifications?

USER: I need only direct flight and I am comfortable with normal cost airline.

ASSISTANT: Please help me with your name for booking.

USER: Myself Deborah Davis.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: No problem, thanks for the information.

ASSISTANT: Thank you for reaching us.