You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Deborah Evans. Could you please help me to change my existing reservation?

ASSISTANT: Sure, wait for a minute.

USER: Sure.

ASSISTANT: Sorry, Evans no reservation found on your name.

USER: That's ok. Thank you for the information.

ASSISTANT: Thank you for your approaching us, have a safe journey.