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

ASSISTANT: Hello, how may I help you?

USER: As my plan to meet my childhood friends after long time got postponed, I want to change my reservation. Can you please help me?

ASSISTANT: Sure, I can help you in that.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your given name.

USER: It's ok, thank you for your information.

ASSISTANT: Thank you for choosing us.