You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I would like to take rest for some more days. Can you help me in changing my existing reservation?

ASSISTANT: Sure, I will help you in changing the reservation. May I know your good name please for checking your reservation status?

USER: Please check with the name Janet Baker.

ASSISTANT: Janet Baker, there is no reservation found with your name in our database to change it.

USER: Oh! I guess my friend has changed on my behalf. Anyways, thank you for the information.

ASSISTANT: Thank you for contacting us.