You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

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

ASSISTANT: Sure, we are here to help you. May I know your name please?

USER: Thank you. I am Ashley Gonzalez.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry, we could not find any reservation on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.