You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I serve you?

USER: I am Stephanie Evans. I Need to book a flight ticket from Detroit to attend my friend's marriage in Denver. Could you please help me with booking?

ASSISTANT: Sure, May I know the journey codes?

USER: My journey codes are MI-DTW and CO-DEN.

ASSISTANT: Please help me with your travel dates.

USER: My travelling dates are 12/20 and 12/22.

ASSISTANT: Please wait a second.

USER: Ok.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no issue.

ASSISTANT: Thank you for opting us.

USER: Thank you for your response.