You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Amanda Barker.

ASSISTANT: How can I help you?

USER: Due to emergency I need to change my existing reservation. Can you help me to change reservation please?

ASSISTANT: Sure, we are here to help you. Please for a minute.

USER: Ok.

ASSISTANT: Thanks for being waiting. We didn't found any reservation by this name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.