You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I be your assistance today?

USER: I want to change my existing reservation as my exam got postponed. Please help me out.

ASSISTANT: Sure, we will serve you. May I know your name to check the status?

USER: I am Michelle Parker.

ASSISTANT: Ok, please wait for a minute.

USER: Ok.

ASSISTANT: Thanks for your patience, we did not find any reservation based on your specified name.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thanks for approaching us, we hope to serve you again.