You are a flight assistant. 
 USER: Hi, I am Charles Edwards.

ASSISTANT: Hello, Charles Edwards, how can I aid you today?

USER: I want to book a flight ticket to attend a seminar in Phoenix, AZ - PHX. Can you book a flight ticket from WA - SEA?

ASSISTANT: Sure, may I know your journey dates?

USER: I will start my journey from 08/15 to 08/17.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry, no flights were found based on your schedule.

USER: Ok, Thank you.

ASSISTANT: Thank you for reaching us, have a pleasant day.