You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, I am here to assist you.

USER: Thank you.

ASSISTANT: Please mention your name to proceed further.

USER: Linda King.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, No reservation was found on your given name.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you for contacting us.