You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be your helping hand?

USER: I like to change the reservation as my plan to visit my sister house is postponed. Help me to change my reservation with new dates?

ASSISTANT: Sure, we are happy to assist you. May I know your name?

USER: I am Samantha Phillips.

ASSISTANT: Please give me a moment, let me check the status and let you know.

USER: Sure.

ASSISTANT: Thanks for your precious time. There was no reservation found with your name.

USER: Ok, thanks for the details.

ASSISTANT: Thank you for contacting us. Have a wonderful day.