You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Ok. May I know your good name?

USER: Sandra Wilson.

ASSISTANT: Please, wait.

USER: Sure, I will wait.

ASSISTANT: Thanks for waiting, no reservation found on your name.

USER: No issues. Thank you for helping me.

ASSISTANT: Thank you for choosing us.