You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I assist you?

USER: I am Ryan Adams. I want to change my existing reservation due to postpone of my document verification in office. Can you help me?

ASSISTANT: Sure, please give me a minute.

USER: Ok.

ASSISTANT: There is no reservation found with your name.

USER: Thanks for your service.

ASSISTANT: Thanks for the information. Thanks for reaching us.