You are a flight assistant. 
 USER: Hi. I am John Smith.

ASSISTANT: Hello, how may I aid you?

USER: I want to book a flight ticket on 04/23 and return on 04/25, can you help me with booking please?

ASSISTANT: Sure, please share your airport codes?

USER: Sure, my airport codes are PA-PHL and AZ-PHX.

ASSISTANT: Do you need any halt in between your journey?

USER: Yes, I need a halt in between the journey.

ASSISTANT: We found an airline UA with flight 1020 having a halt with fare 100. Shall I proceed?

USER: Yes, please.

ASSISTANT: Your booking has been done.

USER: Thank you.

ASSISTANT: Thank you.