You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Scott Hill. I want to change my existing reservation due to sudden change in my trip dates. Can you please help me with that.

ASSISTANT: Sure, please wait for a minute.

USER: Ok, thank you.

ASSISTANT: Scott, there is no reservation found with your details.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for contacting us.