You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I render you today?

USER: I am Elizabeth Clark.

ASSISTANT: Ok.

USER: I want to change my recent reservation, due to health issue. Can you help me out?

ASSISTANT: Sure, I would be happy to help you.

USER: Thank you.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting.

USER: Ok.

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

USER: Not an issue. Thank you for your kind information.

ASSISTANT: Thank you for choosing us, have a good day.