You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am George Walker. Can you please book a flight ticket from BOS to SEA?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates to check the flight availability in your route.

USER: Sure, I need to travel on dates of 08/03 and 08/05.

ASSISTANT: Sorry, no flight in your route with your travel dates.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for your help.

USER: Most welcome.