You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I need to change my reservation as my plan to go for a heritage tour got postponed. Can you help me?

ASSISTANT: Sure, may I know your name?

USER: I am Daniel White.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there are no active reservations on your name to change your flight ticket?

USER: Ok fine, thanks for your response.

ASSISTANT: Thank you for reaching our service.