You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. What can I do for you at this moment?

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

ASSISTANT: Sure, may I know your good name please?

USER: Myself, Nicole Brown.

ASSISTANT: Ok, please wait for few minutes.

USER: Ok,.

ASSISTANT: There is no recent reservation found on your name in our records.

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

ASSISTANT: Thank you for reaching us.