You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Donna Wright. I want to modify my reservation which was booked to New York.

ASSISTANT: Ok.

USER: Help me to change my travelling dates.

ASSISTANT: Sure, I am here to help you. Please wait for a while, I will check your reservation.

USER: Sure.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

USER: Ok, thank you for response.

ASSISTANT: Thank you for contacting us.