You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please help me in changing my existing reservation, as my exam got postponed.

ASSISTANT: Sure, can you please share your name to proceed further?

USER: Myself, Steven Clark.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Thank you for your time, sorry no reservation found on your name.

USER: Ok, no issues, thank you for checking.

ASSISTANT: Thank you for availing us.