You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Can you help me change my existing reservation which was made on the name of Jacob King?

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

USER: Sure.

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

USER: It's ok, thank you for the response.

ASSISTANT: Thank you for reaching us, have a nice day ahead.