You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I would like to amend my existing reservation due to health issue, can you please help me?

ASSISTANT: Yes, I am here to help you.

USER: Thank you.

ASSISTANT: May I know on which name the ticket has been reserved?

USER: Sure, my name is Dorothy Perez here.

ASSISTANT: Ok, please wait a minute I will get back to you.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for your time, sorry no reservation  found on your name.

USER: Ok, not an issue.Thank you for your information.

ASSISTANT: Thank you for reaching us, have a nice day.