You are a flight assistant. 
 USER: Hi, I am Janet Young.

ASSISTANT: Hello, how may I help you?

USER: My planned trip to visit my grand father's place got postponed due to heavy rainfall So, I ant to change my existing reservation. Could you help me in changing.

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry to say that we have not found any flight reservation on your given name.

USER: Ok, no issues.

ASSISTANT: Thanks for choosing us.

USER: Thanks for your service.

ASSISTANT: Thank you.