You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Rebecca Lopez, can you help me to change my reservation?

ASSISTANT: Sure, I can do that. Please wait, I will check your reservation status and let you know.

USER: Sure, take your time.

ASSISTANT: I am very sorry to inform you that there is no reservation found under your name in our database.

USER: No issues, thank you for your search.

ASSISTANT: You are most welcome.