You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me to change dates in my existing reservation?

ASSISTANT: Sure, I am here to help you.

USER: Thank you for your response.

ASSISTANT: Can you mention your name to check further in our database?

USER: Myself Scott Allen.

ASSISTANT: Please wait.

USER: Sure, I will wait.

ASSISTANT:  Sorry, no reservation found on your given name in our database to change it.

USER: No issue, anyway thank you for checking.

ASSISTANT: Thank you for contacting us and have a nice day.