You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Please help me out in booking the ticket from PHL to DTW.

ASSISTANT: May I know your itinerary dates?

USER: My trip dates will be 06/11 to 06/12.

ASSISTANT: Please give me a moment to check for available flights.

USER: Ok, take your time.

ASSISTANT: Please provide your exact travel dates.

USER: 06/13 is my return date of my journey.

ASSISTANT: May I know your name?

USER: Rebecca Lopez is my name.

ASSISTANT: Sorry Lopez, no flight is available on your route.

USER: That's ok, no problem. Thank you for informing.

ASSISTANT: Thank you for choosing us.