You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you please aid me in reserving the flight ticket to reach Washington from Boston?

ASSISTANT: To proceed further I need your source and destination codes.

USER: Thank you.  My source and destination airport codes are BOS and IAD.

ASSISTANT: May I know your trip dates to reserve your seat.

USER: Please reserve the flight ticket for these dates Sept 5th and Sept 7th.

ASSISTANT:  On whose name I have to book the flight ticket?

USER: My name is Stephen Jones.

ASSISTANT:  Could you let us know if you have any class preference?

USER: No, I didn't have any class preference but I prefer a direct flight to travel.

ASSISTANT: Are you looking for any other help from my side please?

USER: No, thanks for asking.

ASSISTANT: We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: It's ok, not a problem with that. Thank you for searching the flights for me.

ASSISTANT: Welcome, have a good day.