You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I would like to change my existing reservation, can you please help me?

ASSISTANT: Sure, on which name can I find reservation?

USER: My name is Benjamin Scott.

ASSISTANT: No reservation found on your name.

USER: No issues, thank you for the information.

ASSISTANT: Thanks for your using our service.