You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I respond to you?

USER: I am Benjamin Scott. I am planning to surprise my mother on her birthday by giving diamond ring, so please help me booking a flight ticket for my home town Detroit.

ASSISTANT: Sure, please provide your travel dates?

USER: I want to fly on 09/09 and return on 09/11.

ASSISTANT: May I know your source and destination points?

USER: My source is Philadelphia, PA - PHL and destination code is MI - DTW.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your preferred dates.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for opting us.