You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Melissa Davis. Can you please help me to reserve a flight ticket from Denver which is departing in the evening time?

ASSISTANT: Sure, when do you want to travel?

USER: The preferable travel dates are June 9th and June 11th.

ASSISTANT: Ok, Kindly mention your journey airport codes.

USER: The source and destination airport codes are DEN and MSP.

ASSISTANT: Ok, Do you have any class preference?

USER: No, I didn't have any class preference.

ASSISTANT: Ok, please wait.

USER: Ok, take your time.

ASSISTANT: Thank you for your time, No flights were found with your given details.

USER: It's ok, not a problem with that. Thank you for your time.

ASSISTANT: Thank you for choosing us.