You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I help you?

USER: I made a reservation earlier this week to go for a health check up. Due to unavailability of doctor I want to change my existing reservation.

ASSISTANT: Sure, let me know your name to change your reservation, please?

USER: I am Amy Thompson.

ASSISTANT: Sorry to say that there was no reservation found under your name.

USER: Ok, no issues. Thanks for your response.

ASSISTANT: Thank you for connecting us. Have a nice day.