You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to change my reservation which I have done last week but suddenly due to the heavy rains in the destination location where I want to travel. Can you please let me to change my reservation?

ASSISTANT: Yes, I will help you with it, can you please provide your name to check the reservation status?

USER: Yes, I am Kevin Walker.

ASSISTANT: I am sorry so say, no reservation found on your name.

USER: That's ok, anyway thank you for the help.

ASSISTANT: Thank you for choosing us.