You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

USER: I want to change my flight reservation as my uncle is unwell, can you please help me?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: My name is Raymond Baker.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for reaching us.