You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Christine Thompson. I want to change my existing reservation, could you help me out?

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

USER: Sure, take your time.

ASSISTANT: Sorry Thompson, there is no reservation found on your name.

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

ASSISTANT: You are most welcome Thompson.