You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am trying to modify the travel dates in the existing reservation because the planned trip got postponed. Can you please help me to change the details?

ASSISTANT: Ok, I will assist you with that. Please can I know your name to check?

USER: Thank you. My name is Stephen King.

ASSISTANT: Thank you for waiting.

USER: Ok.

ASSISTANT: Sorry as per the name provided there are no ticket been found to modify.

USER: It's ok, not an issue. Thank you for your time in checking my ticket status.

ASSISTANT: Thank you for choosing our agency.