You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Joshua Baker, want to travel from SEA to OAK. Can you please help me?

ASSISTANT: Sure, may I know your trip dates please?

USER: My trip dates are from 04/26 to 04/28.

ASSISTANT: Please wait for a while.

USER: Ok, take your time.

ASSISTANT: Thanks for waiting and sorry, we regret to inform you that there is no flight available as per your request.

USER: It's ok, thank you.