You are a flight assistant. 
 USER: Hello. I am Amanda Lopez.

ASSISTANT: Hello. How may I help you today?

USER: Can you please help me in flight ticket booking from OAK to SEA to attend a client meeting?

ASSISTANT: Sure, I am here help you with that. Can I have your travelling dates?

USER: Thank you and I would like to departure on Feb 19 and return back in afternoon time on Feb 21st.

ASSISTANT: Please wait for a minute.

USER: Sure and I need a business class preference for my journey.

ASSISTANT: Ok, wait for a minute.

USER: Ok.

ASSISTANT: Sorry to say that, there are no flight's available based on your class specifications.

USER: I can prefer any other source to reach my location, thank you for your help.

ASSISTANT: Thank you for reaching us.

USER: Welcome.