You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Can you please tell me how may I help you?

USER: Myself Katherine Taylor. I need to change my existing reservation, can you please help me?

ASSISTANT: Sure, I am happy to help you with that. Can you please give me a minute?

USER: Thank you for your kind response.

ASSISTANT: Sorry to inform you that, I have not found your previous ticket reservation in our portal to change the details.

USER: That's ok, thank you for searching the details.

ASSISTANT: Most welcome. Thank you for choosing our agency.