You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Myself Matthew Walker.

ASSISTANT: Nice to meet you Walker.

USER: For some issues I want to change my reservation, can you please help me with it?

ASSISTANT: Sure, please wait a moment let me check.

USER: Sure.

ASSISTANT: There is no reservation existed on your name Walker.

USER: It's ok. Thank you for the information.

ASSISTANT: Welcome, thanks for reaching us.