You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, please standby. I will check and revert to you.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation found in your name.

USER: Ok, not an issue.

ASSISTANT: Thanks for approaching us.

USER: Thank you for information.