You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, may I know your name please to check the reservation status?

USER: Sure, my name is Samantha Mitchell.

ASSISTANT: Samantha, please wait for a minute.

USER: Sure, take your time.

ASSISTANT: Samantha, there is no reservation found with your details.

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

ASSISTANT: Thank you for contacting us, have a good day.