You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you today?

USER: Due to sudden change in my trip dates I need to change my existing reservation. Can you help me in changing my reservation?

ASSISTANT: Sure, may I know your good name to find out the existing reservation?

USER: I am Amanda King.

ASSISTANT: Please hold a minute.

USER: Sure.

ASSISTANT: Thank you for your waiting. There is no active reservation with the given name.

USER: No problem. Thank you for the information.

ASSISTANT: Thank you for availing with us.