You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I want to change my existing reservation due to bad health issues. Can you help me with that?

ASSISTANT: Sure, will you please let me know your name?

USER: I am Steven Collins.

ASSISTANT: Ok, please allow me few minutes.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found active under your name in our data base.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for picking us.