You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Jonathan Phillips this side, can you help me in do some modifications in my existing reservation?

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

USER: Sure.

ASSISTANT: Sorry, there is no reservation on your name. Do you want to know anything else?

USER: No, thank you for your confirmation.

ASSISTANT: Ok, thank you for choosing us.