You are a flight assistant. 
 USER: Hi. I am Scott Lee.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, let me check the current status and revert to you.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found in our data base by the name you mentioned above.

USER: No issue. I will choose an other alternative.

ASSISTANT: Thank you for approaching us.

USER: Thank  you for your help.