You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I want to reserve my ticket from DEN to MSP to visit Minneapolis, can you please help me in booking?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Sure, my planned dates of journey are from Apr, 16 to Apr, 18.

ASSISTANT: Do you have any preferences about flight connections?

USER: Yes, I want to fly in a direct flight.

ASSISTANT: Do you have any preferences about class?

USER: I am ok with any class preference.

ASSISTANT: Please mention your name.

USER: Sure, my name is Katherine Taylor.

ASSISTANT: There is no flights found under your preferable details.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thanks for reaching us, have a great day.