You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you for the day?

USER: I want to change my existing reservation due to some technical issues, can you help me with that?

ASSISTANT: Sure, I am here to help you with that. May I know your name please?

USER: I am Emily Thompson.

ASSISTANT: Please wait for a while, let me check your previous reservation status.

USER: Sure.

ASSISTANT: Thank you for waiting. There is no reservation found on your name in our database to change.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us, have a great day.

USER: Thank you for your response.

ASSISTANT: Most welcome.