You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Betty Wright.

ASSISTANT: How can I help you Betty?

USER: I want to change my reservation due to health problem, can you help me?

ASSISTANT: Sure, I will help you. Please wait for a while.

USER: Sure.

ASSISTANT: Sorry Betty, no reservation is found under your name.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for reaching us.