You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I need to change my reservation due to urgent meeting, can you help me?

ASSISTANT: Sure, may I know your name please?

USER: I am Debra Walker.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Walker, there is no reservation found as per your name in our database.

USER: That's ok. Thank you for your help.

ASSISTANT: Thank you for reaching us with a query.