You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I need to reserve flight ticket from MSP to IAD, can you please help me?

ASSISTANT: Sure, can you share me your trip dates?

USER: Sure, my travelling dates are Jun, 23 and 25.

ASSISTANT: Do you have any class preference?

USER: I am ok with any class to travel.

ASSISTANT: Is there any other specifications?

USER: Yes, I need a connecting flight to travel.

ASSISTANT: May I know your name please.

USER: Sure, my name is William Carter here.

ASSISTANT: Sorry, no flights are found on your trip dates.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for reaching us.