You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, I will help you with that. May I know your name please.

USER: Sure, I am Christine Thompson.

ASSISTANT: Please wait for some time.

USER: Sure.

ASSISTANT: Sorry, no reservation is found on your name in our database.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.