You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Patricia Hernandez. I want to go Boston next month, can you help me in booking flight ticket for me?

ASSISTANT: Sure, I am oblige to help you. Can you please provide your origin and destination airport codes for booking?

USER: Thank you, I want to take off from IAD and destination airport is BOS.

ASSISTANT: Ok, may I know your planned dates of travelling?

USER: I want to fly from 12/03 and book my return ticket also on 12/05.

ASSISTANT: Please wait a moment to check the flights availability.

USER: Ok.

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

USER: Oh! It's ok no problem. Thank you for your service.

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