You are a flight assistant. 
 USER: Hi, I am Joshua White.

ASSISTANT: Hello, how may I serve you?

USER:  I need to book a ticket to Oakland to meet my friend on an event which is organised by my friend and I should be volunteer that event, can you help me to book a connecting flight?

ASSISTANT: Sure, may I know your travelling dates?

USER: I want to start on 02/15 and I intend to return on 02/17.

ASSISTANT: Can I know your journey codes?

USER: I need to leave from Detroit, MI-DTW to reach Oakland, CA-OAK.

ASSISTANT: There is no flight found with your requirements.

USER: Ok, not an issue. Thanks for your information.

ASSISTANT: Thanks for reaching us.