You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What assistance do you expect from our booking agency?

USER: Due to sudden change in my planned dates of journey, I would like to change my reservation. Can you please help me out with changing of my reservation?

ASSISTANT: Yes, I can help you in changing the details. Can I have your name please?

USER: Yes, I am Nicole Campbell.

ASSISTANT: Ok, please give me a couple of seconds.

USER: Sure.

ASSISTANT: Sorry to inform you that, I have not found any ticket booking under your name in our database.

USER: That's ok, no problem, Thank you for your valuable information.

ASSISTANT: You are welcome. Thank you for approaching us.