You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Because of an urgency, I need to change my existing reservation.

ASSISTANT: Ok, may I know your name please?

USER: My name is Michelle Harris.

ASSISTANT: Michelle, there is no reservation found under your name.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.Have a nice day.

USER: Thank you for your help.