You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be your helping hand today?

USER: Can you change my existing reservation?

ASSISTANT: Sure, may I know your name please? Please wait for a while.

USER: My name is Katherine Martinez. Sure.

ASSISTANT: Thank you for waiting. We hardly tried to find your reservation but, no reservation has been found with your name.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for reaching us.