You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure, I am here to help you out.

USER: Thank you for accepting my request.

ASSISTANT: May I know your name please?

USER: My name is Pamela Smith.

ASSISTANT: Wait a moment please.

USER: Ok, I will wait for your response.

ASSISTANT: Pamela Smith, we haven't found any reservation under your name in our database.

USER: It's ok, not a problem with that. Anyways thank you for checking the ticket status.

ASSISTANT: Thank you for approaching us.

USER: You are welcome.