You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Brenda Clark. I would like to change my resent reservation,can you help me with it?

ASSISTANT: Sure. Please wait for a moment, while I check with your reservation.

USER: Ok.

ASSISTANT: Thanks for waiting, Sorry to inform you there is no any reservation found on your name in our system data.

USER: No problem. Thank you for your help.

ASSISTANT: Thank you for reaching us.