You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: I want to change an existing reservation due to sudden change in my trip.Can you help me.

ASSISTANT: Sure, may I know your name?

USER: I am Ronald Wright.

ASSISTANT: Wait a while.

USER: Ok.

ASSISTANT: Thanks for waiting, we did not found any reservation by this name.

USER: No issue. Thank you.

ASSISTANT: Thanks for contacting us.