You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Can you help me to change dates in my existing reservation?

ASSISTANT: Sure, may I know the name?

USER: Please check the ticket on the name Kenneth Clark.

ASSISTANT: Please be on hold, I will get back to you in a minute.

USER: Sure, I will wait.

ASSISTANT: Thank you for waiting. Here, there is no active reservation have been found under your name in our database to amend it.

USER: No issue, anyway thank you for checking.

ASSISTANT: Thank you for reaching us.