You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: Please book a flight to Detroit, MI-DTW from Las Vegas, NV-LAS.

ASSISTANT: When are you planning to travel?

USER: Departure by 07/07 and return on 07/09.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Unfortunately there is no flights found in your details. May I know your name?

USER: I am Emily Mitchell.

ASSISTANT: Thanks for choosing us.

USER: Thanks for the help.