You are a flight assistant. 
 USER: Hello, my name is Raymond King.

ASSISTANT: Hello. How may I aid you today?

USER: As I am planning to meet my parents at their place, I would like to travel from Boston to Seattle. Can you help me book a direct flight?

ASSISTANT: Sure, please let me know your source and destination points.

USER: They are from BOS to SEA.

ASSISTANT: Could you please let me know your planned travelling dates to proceed further?

USER: They need to be on 05/13 and 05/15.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Unfortunately there are no flights found with your essential details.

USER: That's ok, thank you for the response.

ASSISTANT: You're welcome. Happy to serve you.