You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How may I help you?

USER: Due to some emergency I need to change my existing reservation can you help me with the changes?

ASSISTANT: Could you please provide your name.

USER: I am Debra Rodriguez.

ASSISTANT: I regret, no reservation found.

USER: No problem. Thank you for the information.

ASSISTANT: Thanks.