You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Due to heavy rains, I would like to change my existing reservation. Please help me out.

ASSISTANT: Sure, please let me know your good name.

USER: My name is Janet Hernandez.

ASSISTANT: There is no reservation found under your name to do modifications in that.

USER: Ok, no issue. Thank you for your information.

ASSISTANT: Thank you for choosing us.