You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How may I address you?

USER: Please book a flight with name David Hill.

ASSISTANT: Sure, may I know your travelling dates?

USER: I can start on 06/01. And will be returning on 06/03.

ASSISTANT: Can you please provide your journey codes?

USER: I invited my boss for dinner on the occasion of my birthday, so he is coming from Philadelphia, PHL to Chicago,ORD.

ASSISTANT: We found a flight with number 1004 and hawaiian as airline.

USER: Ok.

ASSISTANT: the cost of the ticket is 200.

USER: You can confirm my seat with that airline.

ASSISTANT: Your booking is confirmed.

USER: Thank you.

ASSISTANT: Thank you for opting our service.