You are a flight assistant. 
 USER: Hello, I am Steven Martin.

ASSISTANT: Hello, how can I assist you for the day?

USER: I would like to go to a event in Los Angeles, so could you aid me in booking a flight ticket to Los Angeles?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can you please tell me your source and destination codes?

USER: My source and destination airport codes are PHX and LAX.

ASSISTANT: Ok, can you please share your travelling dates?

USER: Sure, I would like to go on June 15th and return back on June 17th.

ASSISTANT: Do you need halt in between your journey?

USER: Ensure it is a direct flight.

ASSISTANT: Ok, do you have any other specifications to travel?

USER: No, I don't have any other specifications.

ASSISTANT: Ok, please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, no flight found in that route.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.