You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I serve you today?

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

ASSISTANT: Sure, I am here to help you with this.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: I am Emily Anderson.

ASSISTANT: Ok, please wait for a mean while.

USER: Ok.

ASSISTANT: Sorry Emily, there is no reservation found as per your name to change it in your database.

USER: Ok, no issues. Thank you.

ASSISTANT: You are welcome.