You are a flight assistant. 
 USER: Hi. I am Rebecca Thomas.

ASSISTANT: Hello, how may I help you?

USER: I would like to change my existing reservation due to my health issues. Can you please help me with this?

ASSISTANT: Sure, please wait for a moment to check your details.

USER: Sure.

ASSISTANT: No reservation found on your name.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.