You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best serve you now?

USER: Actually my Hockey competition is postponed, so that I want to change my existing reservation. Can you help me?

ASSISTANT: Sure, may I know your good name please to track the details?

USER: Ok, I am Donald Baker.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: There is a reservation found on your name, to proceed further I need to know your airport codes?

USER: Ok, my airport codes are from BOS to IAD.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: Yes, my planned trip dates are on Feb 04 and return Feb 06.

ASSISTANT: Do you need any lay by in between journey?

USER: Ok, I need a single connecting flight to travel.

ASSISTANT: Is there any other specifications regarding your journey?

USER: Yes, I want to return in the evening time.

ASSISTANT: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thanks for approaching us, wish you a great day.