You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I have planned to go for AUS but I have a work in SEA, so I have to change my reservation from AUS to SEA.Can you please help me in changing my existing reservation?

ASSISTANT: Sure, I will definitely help you about it.Can you please let me know your name to check existing reservation?

USER: Please search my reservation in the name of Donna Thomas.

ASSISTANT: Sorry for the inconvenience, in our listing I do not find any reservation under the name which you have mentioned before.

USER: Ok, fine thank you for your information.

ASSISTANT: Thank you for contacting our services.Hope you have a great day ahead.