You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you help me booking a flight ticket from EWR to SEA?

ASSISTANT: Sure, I will help you. Can you please let me know your travel dates?

USER: I will start on Aug, 25 and return on Aug, 27.

ASSISTANT: Ok, may I know your name?

USER: I am Donald Allen.

ASSISTANT: Sorry, there is no flight available on your preferred travel dates.

USER: No problem, thank you for the information.

ASSISTANT: You are welcome and thank you for choosing us.