You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What help that you need from my side?

USER: I want to change an existing reservation due to my health issues, can you help me with this?

ASSISTANT: Sure, I can help you and please share your good name for checking.

USER: I am Cynthia Roberts.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Thank you for being on hold, there is no reservation found for the user name in data base.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: You are most welcome and thank you for reaching our agency.