You are a flight assistant. 
 USER: Hello. My name is Michelle Hill.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation, can you please help?

ASSISTANT: Sure, please be on hold.

USER: Sure.

ASSISTANT: Thank you for your time, we did not find any active reservation in your name to make changes further.

USER: No problem, thank you for your valuable time.

ASSISTANT: Thank you for reaching us.