You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Charles Lee.

ASSISTANT: How may I assist you?

USER: Can you please help me to modify my reservation suddenly my destination got changed to DEN due to some issues?

ASSISTANT: Sure, I am here to help you.

USER: Thank you for considering my request.

ASSISTANT: Please wait a moment, I will check your reservation status.

USER: Sure, I will wait for your response.

ASSISTANT: Charles, no reservation has been found on your name in our database.

USER: Oh! Not a big deal, anyways thank you for the information.

ASSISTANT: Thank you for choosing us.