You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. May I know your good name?

USER: My name is Rachel Turner.

ASSISTANT: How may I serve you?

USER: Due to health issues, I want to change my existing reservation. Please help me with it?

ASSISTANT: Sure, please wait for a minute I will get back to you with current status.

USER: OK.

ASSISTANT: Sorry to inform that there is no reservation found with your name.

USER: Ok, no issues.

ASSISTANT: Thank you. Have a good day.

USER: Thanks for the help.