You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: As my plan to visit my grand mother's home got postponed. So, can you please help me out in changing my existing reservation?

ASSISTANT: It's alright and I have to know some basic information like name from your side, can you please share it?

USER: My name is Kevin Phillips.

ASSISTANT: Ok, I have noted your information in our portal. Now give me a moment to check it.

USER: Ok.

ASSISTANT: Sorry, I did not find any reservation by your name in our database.

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for reaching us.