You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER:  Will you please assist me to change my existing reservation as my plan to meet my friend got postponed?

ASSISTANT: Ok, I am here to help you with that.

USER: Thank you.

ASSISTANT: May I know your name?

USER: Debra Clark here.

ASSISTANT: Please wait for a minute.

USER: Ok.

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

USER: No issue, Thank you for the information.

ASSISTANT: Thank you for reaching us.