You are a flight assistant. 
 USER: Hello. I am Dennis Wright.

ASSISTANT: Hello Dennis, how may I help you?

USER: I want to travel from SEA to OAK for my business purpose.

ASSISTANT: Sure can I know your trip dates?

USER: Please book a flight ticket for me on 03/02 to 03/04.

ASSISTANT: Give me a moment, I will check and let you know about availability.

USER: Ok, take your time.

ASSISTANT: Sorry Dennis, there is no flight available on your required dates.

USER: Ok, no issues.

ASSISTANT: Thank you for contacting us.

USER: Thank you.