You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Sure, I  can help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: I am Nancy King.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Thanks for being waiting. We didn't found any reservation by this name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for picking us.