You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: My name is Emma Smith.

ASSISTANT: Yes Smith, I am here to help you.

USER: I want to change my existing reservation due to postpone of my friend marriage.

ASSISTANT: Ok, give me while let me check your details.

USER: Sure.

ASSISTANT: You have no reservation on your name.

USER: No issue, thank you for checking.

ASSISTANT: Thank you for reaching us. Thank you.