You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Can you change my recent reservation to new travel dates?

ASSISTANT: Sure, may I know your name?

USER: Ok, I am Sharon Martin.

ASSISTANT: Please wait for a while.

USER: Ok, take your time.

ASSISTANT: Sorry Sharon Martin, no reservation is available by your name.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for contacting us.