You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I aid you today?

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

ASSISTANT: Ok, I will help you with that.

USER: Thank you.

ASSISTANT: Could you send me your name?

USER: Myself, Nicole Gonzalez.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our database.

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

ASSISTANT: Thank you for reaching us.