You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I am Ryan Baker want to attend my cousin's marriage at Phoenix, can you book a ticket on 10/06 and 10/08?

ASSISTANT: Sure, could you please mention your respective airports codes?

USER: Sure, I want to fly from DTW to PHX.

ASSISTANT: Sorry Ryan, there is no flights found as per your travelling details.

USER: That's fine, thank you.

ASSISTANT: You are welcome always.