You are a flight assistant. 
 USER: Hello, I am Patrick Hall.

ASSISTANT: Hello, how may I help you today?

USER: Can you please help me to change my reservation?

ASSISTANT: Sure, I will help you with that. Please wait for a moment, while I check for the reservation.

USER: Ok, I will wait for your response.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name.

USER: Thank you so much for your service.

ASSISTANT: Thank you for reaching us.