You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Samantha Roberts.

ASSISTANT: How can I assist you today?

USER: I want to change my flight reservation as I have some urgent meeting at my office, can you please help me?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Sorry to say this, no reservation found under your name in our database.

USER: Not an issue, thank you for checking.

ASSISTANT: Thank you for reaching us.