You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I am Raymond Rodriguez.

ASSISTANT: Nice to meet you Raymond. Welcome to flight booking agency.

USER: I would like to book a ticket to Boston as I am leaving for business meet, can you please help me out?

ASSISTANT: Sure, I am oblige to help you. Can you please provide your preferable dates that you want to travel?

USER: I am travelling on these dates 09/19 and 09/21.

ASSISTANT: Ok, may I know your source and destination airport codes for booking?

USER: I am flying from PHL to BOS.

ASSISTANT: Please wait a moment to check the flights.

USER: Ok.

ASSISTANT: Sorry to inform you that, there are no flights moving to your locations with your requested dates of travelling.

USER: Ok no problem, thank you for your services.

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