You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I want to do some changes in my existing reservation, as my friends are not able to come on the dates which we planned before, can you please help me out?

ASSISTANT: Sure, I can help you with that. May I know your name to proceed further?

USER: My name is Deborah Collins.

ASSISTANT: Please allow me a moment to check the details for you.

USER: Sure.

ASSISTANT: Your patience is greatly appreciated. Deborah, there is no reservation found under your name.

USER: Ok, no problem. Thank you for helping me.

ASSISTANT: You are welcome. Thank you for contacting us.