You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you now?

USER: I made a reservation earlier to meet my grandparents who are staying at Houston, but due to some work load I am unable to meet. Can you help me in changing my reservation?

ASSISTANT: Sure, I will help you to change your reservation.

USER: Thank you for your response.

ASSISTANT: May I know your good name?

USER: Sure, Nicole Jones here.

ASSISTANT: Please wait for a moment, while I check for the reservation.

USER: Sure.

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

USER: Ok, no problem. Thank you for your quick response.

ASSISTANT: Thank you for visiting us, we hope see you again.