You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Amy Johnson here.

ASSISTANT: Amy Johnson, how may I assist you today?

USER: I want to change my existing reservation due to some health reason. Can you help me for this one.

ASSISTANT: I am sorry to hear that. I will help you. Please allow me a minute.

USER: Sure, take your time.

ASSISTANT: I see that there is no active reservation booked on your name.

USER: No issues, thank you for your response.

ASSISTANT: Thank you for reaching us. Have a good time.