You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, can you please provide me your name to check the reservation?

USER: I am Eric Martin.

ASSISTANT: Sorry, there is no reservation with your given name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.