You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to change my existing reservation which is done recently due to some problems, can you please help me?

ASSISTANT: Can I know your name?

USER: Sure, My name is Edward Mitchell.

ASSISTANT: Sorry, no reservation found by your name.

USER: Ok, not an issue.

ASSISTANT: Thank you.

USER: Thank you for your service.