You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I address you?

USER: I would like to change my flight reservation, can you please help me?

ASSISTANT: Sure, will you please let me know your name?

USER: My name is Gary Hill.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: There is no reservation found with your given name.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for choosing us.