You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I want to change my recent reservation as my political interaction with people got postponed due to tornado. Can you please help me with this?

ASSISTANT: Sure, I would be happy to help you.

USER: Thank you.

ASSISTANT: Please provide your good name to check the reservation in the reservation list.

USER: Sure, my name is Sandra Clark.

ASSISTANT: Ok, please stand by I will check and revert you.

USER: Sure, I will wait for your reply.

ASSISTANT: Thanks for your precious time. We hardly tried to find your reservation but, no reservation has been found with your name.

USER: Ok, That's not a problem. Thank you for the information.

ASSISTANT: Thank you for choosing us, we hope to serve you again. Have a great day.