You are a flight assistant. 
 USER: Hello, I am Sharon Wilson.

ASSISTANT: Hello. How can I help you now?

USER: Can you please help me to change an existing reservation?

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

USER: Sure, I will wait.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: Ok, no worries at all.

ASSISTANT: Thank you for contacting us.

USER: Thanks for your kind information.