You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Jennifer Allen, can you please help me to modify my reservation as my scheduled got postponed to some other day?

ASSISTANT: Sure, I will help you. Please wait for a while.

USER: Thank you for considering my request and will wait for your response.

ASSISTANT: Sorry, there is no reservation existing on your name.

USER: Not an issue with that, anyways thank you for the information.

ASSISTANT: You are welcome, have a nice day.