You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I need to change my recent reservation due to my health issues, can you help me in doing that?

ASSISTANT: Sure, I am here to help you. Please let me know your good name.

USER: I am Christine Mitchell.

ASSISTANT: Sorry, we did not find any active reservation on your name in our records.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for contacting us.