You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Andrew King.

ASSISTANT: King, how may I assist you?

USER: I would like to travel to BOS from IAD, can you book a flight?

ASSISTANT: Sure, I can book a flight for you.

USER: Sure, the trip dates are 03/21 to 03/23.

ASSISTANT: Let me check for available flight's.

USER: Ok.

ASSISTANT: Sorry King, we could not find a flight for you.

USER: Ok, no problem.

ASSISTANT: Do you have any other planned dates?

USER: Thank you for your response.

ASSISTANT: Thank you for reaching us.