You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to change my reservation, due to heavy rainfall in Seattle, can you help me?

ASSISTANT: Yes, can you share me your name?

USER: My name is Stephanie Carter.

ASSISTANT: Can you tell me your travelling dates?

USER: I am departing on Sep 09 and return on Sep 11.

ASSISTANT: Can I know your new airport codes?

USER: My departure airport code is AUS and willing to land in IAD.

ASSISTANT: Do you have any other specifications?

USER: I need a flight with connection limit 0 with economy class.

ASSISTANT: Do you have any preferences?

USER: I do not have any other preferences.

ASSISTANT: I have found an economy class ticket with a price of 200 and it is a direct flight.

USER: Thank you for your help. Please proceed for booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching us.