You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Shirley Campbell. Owing to emergency, I need to change my recent reservation. Please help me with that.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there is no active reservation found in your name to change.

USER: Nothing to worry. Thanks for letting me know.

ASSISTANT: Thank you for reaching us.