You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Cynthia Evans.

ASSISTANT: What service that you are seeking from our agency Evans?

USER: I want to go Washington next month for attending a seminar there, can you please book a flight ticket from San Francisco?

ASSISTANT: Sure, I am oblige to help you.

USER: Thank you.

ASSISTANT: Can you please provide your planned dates of travelling?

USER: I want to take off on 06/15 and also confirm my return ticket also on 06/17.

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

USER: I want to fly from SFO and destination airport is IAD.

ASSISTANT: Please wait a moment to check the best flights in your route.

USER: Sure, take your own time.

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, I will go with another airline.

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

USER: Thank you for your service.

ASSISTANT: Welcome.