You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I assist you today?

USER: I am Cynthia Martin.

ASSISTANT: Thanks for sharing your name.

USER: I would like to change my existing reservation, because I postponed my travel due to heavy rainfalls. Can you help me in this?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: Ok, Thank you.

ASSISTANT: Thank you for reaching us.