You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I just want to change an existing reservation as my meeting got post pone due to some technical issues.Can you help me?

ASSISTANT: Please share your name to proceed for booking?

USER: Kimberly Lewis here.

ASSISTANT: No reservation found in our database at the moment.

USER: No issue, Thank you.

ASSISTANT: Thank you.