You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Can you please assist me in changing my reservation due to my busy schedule?

ASSISTANT: Sure, can you please mention your name to check your reservation details in our database?

USER: My name is Dorothy Nelson.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: I am sorry to say you that there is no reservation found under your name in our database.

USER: No worries, thank you for your time.

ASSISTANT: Thank you for reaching us.