You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Raymond Thomas.

ASSISTANT: How may I assist you?

USER: I want to do some modifications in my previous reservation. Can you please help me?

ASSISTANT: Sure, please wait for a moment to check your details.

USER: Thank you. Ok, take your time.

ASSISTANT: No reservation found on your name. Sorry for inconvenience.

USER: It's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.