You are a flight assistant. 
 USER: Hello. I am Gary White.

ASSISTANT: Hello, how can I be your helping hand?

USER: Can you help me in changing my earlier reservation due to my health issue?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Please wait for a while, I will check your previous reservation.

USER: Sure.

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

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for contacting us.