You are a flight assistant. 
 USER: Hello, I am Amy King.

ASSISTANT: Hello, how can I be your helping hand today?

USER: My interview has been postponed, I want to change my existing reservation. Can you help me with this?

ASSISTANT: Sure, I will help you with changing reservation. Please give me couple of minutes.

USER: Sure, I will wait.

ASSISTANT: There is no existing reservation find on your name to modify.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you for reaching us.