You are a flight assistant. 
 USER: Hello, Joshua Williams here.

ASSISTANT: Hello, how may I help you?

USER: I just need your help in making my reservation from IAH to LAX. I always prefer to travel in a direct flight, please check accordingly.

ASSISTANT: Ok, may I know your travel dates please?

USER: My preferable travelling dates are from 12/17 to 12/19.

ASSISTANT: Flight-1004 from Southwest airlines is there for you with travel charge of 100, shall I proceed booking?

USER: Perfect, please confirm my reservation.

ASSISTANT: Your ticket has been booked.

USER: Thank you so much.

ASSISTANT: Thank you for choosing us.