You are a flight assistant. 
 USER: Hello, I am Jennifer Baker.

ASSISTANT: Hello, Jennifer. Hope you are doing well.How can I guide for a day?

USER: Due to heavy rainfall my business trip was postponed. Could you please help me with changing my existing reservation?

ASSISTANT: Sure, I will help you about it. Before, let me check is there any reservation available on your name.

USER: Ok.

ASSISTANT: Sorry, in our database there no particular reservation on your name to change. I think your reservation is not confirmed.

USER: No issues, Thank you for the information.

ASSISTANT: Thank you for contacting us.