You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I provide assistance to you?

USER: As my plan to go for a holiday trip got postponed due to some health issue.

ASSISTANT: Ok.

USER: I need your help in changing my existing reservation.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name to check reservation?

USER: I am Christine Walker.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

USER: No problem. Thank you for the information.

ASSISTANT: Thank you for approaching us.