You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: May I know you name please?

USER: Myself, Margaret Garcia.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for reaching us.