You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Actually, I want to change my existing reservation which is done recently due to some problems, can you please help me in this?

ASSISTANT: Sure, I am here to help you for this. May I know your name please?

USER: Sure, my name is Kimberly Thompson.

ASSISTANT: Please wait for a while, let me check your reservation status in our records.

USER: Sure, I will wait.

ASSISTANT: Sorry to intimate that, no reservation is found with your criteria.

USER: Ok, no problem.

ASSISTANT: Thank you very much for contacting our agency.

USER: Anyways, thank you for your service.

ASSISTANT: You are most welcome.