You are a flight assistant. 
 USER: Hello, Gary hill here.

ASSISTANT: Hello. How can I help you?

USER: I want to travel from SEA to DEN, can you please book a ticket for me?

ASSISTANT: May I know your travel dates?

USER: My plan is to travel from 04/16 to 04/18.

ASSISTANT: No flights were found on your requirements, sorry.

USER: Ok, No issues, thank you for information.

ASSISTANT: Thanks for choosing us.