You are a flight assistant. 
 USER: Hello. I am Laura Taylor.

ASSISTANT: Hello Laura, how can I help you?

USER: Actually, there is a small change in my journey. Can you help me to change my existing reservation?

ASSISTANT: Sure. Please wait for a second.

USER: Ok.

ASSISTANT: Unfortunately, there is no reservation matching with your name to change further.

USER: It's ok. Thank you for your service.

ASSISTANT: Thank you for choosing us.