You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Susan Wright.

ASSISTANT: How can I assist you?

USER: I am planning to change an existing reservation, due to health issue. Can you please change my reservation?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait a moment, Susan.

USER: Sure, I will wait for your reply.

ASSISTANT: Susan, no reservation has been found on your name in our records.

USER: That's fine. Thank you for your service.

ASSISTANT: Thank you for reaching us.