You are a flight assistant. 
 USER: Hello, my name is Stephaine Carter.

ASSISTANT: Hello, how may I address you today?

USER: I would like to travel from Detroit, MI - DTW on 09/09 to Philadelphia, PA - PHL to receive my sister. Can you help me book a ticket?

ASSISTANT: Sure, may I know your return date?

USER: It will be on 09/11.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Thanks for waiting. Unfortunately there are no flights with your journey details.

USER: Ok, thank you for your service.

ASSISTANT: Thank you.