You are a flight assistant. 
 USER: Hello, I am Mark Campbell.

ASSISTANT: Hello, how can I provide assistance to you?

USER: Due to sudden demise of my grandfather, I want to travel to Minneapolis, MN-MSP. Can you please book me a ticket for direct flight?

ASSISTANT: Sure, can you please let me know your travelling dates?

USER: My travelling dates are from 08/25 to 08/27.

ASSISTANT: Kindly assign your boarding point?

USER: My boarding point is Seattle, WA-SEA.

ASSISTANT: Thank you for providing your details, please wait for a while.

USER: Ok.

ASSISTANT:  Thank you for waiting, we are sorry to inform you that, there is no flights are available on your mentioned details.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.