You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Dennis Wright.

ASSISTANT: How can I assist you today?

USER: I want to change my existing reservation due to heavy rainfall, can you please help me with that?

ASSISTANT: Ok, I will certainly help you with the flight ticket booking.

USER: Thank you.

ASSISTANT: Thank you for waiting. Sorry, there is no reservation been found on your name to change.

USER: Not an issue, thank you.

ASSISTANT: Thank you for connecting with our agency.