You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please change my existing reservation due to bad health issues?

ASSISTANT: Sure, may I know your name?

USER: I am Jerry Garcia.

ASSISTANT: Thank you. Please wait for a while, let me check your reservation status in our database.

USER: Sure.

ASSISTANT: Jerry Garcia, there is no reservation found under your name in our database.

USER: Ok, no issues. Thank you.

ASSISTANT: You are welcome and thank you for contacting us.