You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change my reservation due to sudden change in my trip, can you assist me?

ASSISTANT: Sure, may I know your name please?

USER: Eric Lopez.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

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

USER: No problem, thank you for searching.

ASSISTANT:  Thank you for reaching us.