You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I want to book a flight ticket from San Francisco SFO to Phoenix PHX. Can you make a reservation for me?

ASSISTANT: Please share your travelling dates.

USER: Ok, my planned trip dates are on Aug 25 and return on Aug 27.

ASSISTANT: Do you need any connection limit?

USER: Yes, I need a direct flight to travel.

ASSISTANT: May I know your preferable timings?

USER: No, I don't have any timings.

ASSISTANT: Do you need any other specifications?

USER: No.

ASSISTANT: Can you give your name for reservation.

USER: Ok, my name is John Thomas.

ASSISTANT: There are no flights found on your required routes.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.