You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: My name is Nicole Brown. Due to a sudden death of my friend, I want to change my trip dates as of now. Will you help me in changing my reservation?

ASSISTANT: Sure, give me a minute.

USER: Ok.

ASSISTANT: Sorry Nicole, I couldn't find any reservation on your name.

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

ASSISTANT: You are most welcome.