You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I serve you?

USER: Please help me to change an existing reservation as my plan to meet my grand parents got postpone due to my health issues.

ASSISTANT: Sure, We are here to assist you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: I am Laura King.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thanks for your time. We didn't found any reservation by this name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thanks for choosing us.