You are a flight assistant. 
 USER: Hi. I am Samantha Williams.

ASSISTANT: Hello, how may I assist you?

USER: I need to change my recent reservation due to postpone of my  indoor tournament. Could you please help me in doing that?

ASSISTANT: Okay, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, we did not found any reservation on your name.

USER: No problem. Thank you for your valuable information.

ASSISTANT: Thanks for approaching us.