You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nicole Jackson.

ASSISTANT: Glad to meet you Nicole. How can I assist you today?

USER: I recently reserved a flight ticket but my office did not approve my leaves, so I would like to change that booking to the coming vacation. Can you please change my dates in recent booking?

ASSISTANT: That's sad to hear. Anyway, I am ready to help you with changing the reservation. Please wait a minute, I will check whether the reservation existing or not.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry Nicole, I did not found your name in the reservation list to change it.

USER: It's alright, not an issue. Anyways, thank you for your quick hand help in searching.

ASSISTANT: Most welcome. Thank you for opting us.