You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I am Deborah Hill. I want to change my existing reservation, due to health issue. Can you help me in my changing reservation?

ASSISTANT: Sure, please wait a while.

USER: Sure, I will wait for your response.

ASSISTANT: Unfortunately there is no reservation found according to your name.

USER: Not an issue, thank you for your kind information.

ASSISTANT: Thank you for reaching us.