You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Owing to have an emergency work, I need to change the reservation.

ASSISTANT: Ok. Can you please provide your name to check the reservation?

USER: Mark Nelson is my good name.

ASSISTANT: Ok, please wait.

USER: Sure, I will wait.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Fine, thank you.

ASSISTANT: Thank you for contacting us.