You are a flight assistant. 
 USER: Hi. I am Donald Mitchell here.

ASSISTANT: Hello, how may I help you?

USER: I want to reserve my ticket from SEA to CLT, can you please help me out?

ASSISTANT: Sure, may I know your trip dates?

USER: Sure, my planned dates of journey are from Sep, 22 to Sep, 24.

ASSISTANT: Please wait for a while.

USER: Sure, I will wait.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: Most welcome.