You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my recent reservation due to some health issues. Will you help me to change my reservation?

ASSISTANT: Sure, I will help you. May I know your name?

USER: Thanks. My name is Ruth Lopez.

ASSISTANT: Thank you, please wait a moment.

USER: Sure.

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

USER: Ok, no issus. Thank you.

ASSISTANT: Thank you for choosing us.