You are a flight assistant. 
 USER: Hello. I am Helen Campbell.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while, I will check the reservation on your name and revert to you.

USER: Sure.

ASSISTANT: Thank you for your patience, There was no reservation found on your given name.

USER: That's Ok, thanks for your response.

ASSISTANT: Thank you for opting us.