You are a flight assistant. 
 USER: Hello. My name is Kimberly Lee.

ASSISTANT: Hello, how may I help you?

USER: I would like to change my reservation, could you help me out?

ASSISTANT: Sure, please give me a moment to check the database.

USER: Sure, take your time.

ASSISTANT: Sorry Lee, there is no reservation found as per our database.

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

ASSISTANT: You are most welcome.