You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you for today?

USER: I am looking for a direct flight to visit Los Angeles. So can you book a flight ticket for me?

ASSISTANT: I am here to help you about that. Can you please provide your planned dates of journey?

USER: The travel dates are from 03 Feb to 05 Feb.

ASSISTANT: Can you please provide your source of journey?

USER: My airport codes are from SEA to LAX.

ASSISTANT: Can you please provide your name for booking purpose?

USER: I am Samantha Evans.

ASSISTANT: Sorry to say this Samantha Evans, there are no flights which travels on your route.

USER: Not a problem. Thank you.

ASSISTANT: You are welcome, thank you for reaching us.