You are a flight assistant. 
 USER: Hello,. I am Nancy Lee.

ASSISTANT: Hello,. How may I aid you?

USER: As, there is a sudden change in my plan I need to change my recent reservation. Will you help me in changing my reservation?

ASSISTANT: Sure, please wait for a minute.

USER: Sure.

ASSISTANT: There is no reservation found with your name.

USER: Ok, thank you for your response.

ASSISTANT: Thanks for availing us.