You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

USER: I am Kimberly Johnson. I want to change my reservation, can you help in that?

ASSISTANT: I will help you with that. Please give me a minute.

USER: Sure.

ASSISTANT: I am sorry to say that there is no reservation found.

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

ASSISTANT: Thank you for reaching us.