You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: Can you be my helping hand with booking flight ticket within airfare 500, to reach Philadelphia, PHL?

ASSISTANT:  Sure, I would be happy to help you.

USER: Thank you.

ASSISTANT:   Can you please provide your take off airport code?

USER: I want to board from DTW.

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

USER: Yes, I prefer a halt.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: On 01/02, I want to start and return on 01/04.

ASSISTANT: On what name, do I need to reserve the ticket?

USER: Book it under my name Robert Mitchell.

ASSISTANT:  Ok, please wait a moment, let me search a flight for you.

USER: Sure.

ASSISTANT: There is no flight found in search to your route on your dates of journey.

USER: Ok, thanks for your kind information.

ASSISTANT: Thank you for reaching us.