You are a flight assistant. 
 USER: Hello, myself Mary Lee.

ASSISTANT: Hello, how can I help you?

USER: I would like to change my existing reservation. Please help me out.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Mary, there is no reservation found with your details.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for reaching us.