You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you at this moment?

USER: I need to change my reservation because I need to attend another event on reserved dates so please help me with changing my reservation details.

ASSISTANT: Sure, I will help you with this.

USER: Thank you.

ASSISTANT: Can you please provide the name on which you have done the reservation previously?

USER: Sure, please check the reservation with my name Thomas Lopez.

ASSISTANT: Wait a moment please.

USER: Sure, I will wait for your response.

ASSISTANT: Thomas Lopez, there is no active reservation found under your name in our listings.

USER: Oh! May be booking has not done properly due to server issue.

ASSISTANT: Thank you for opting us.

USER: Anyway, thank you for your valuable time.

ASSISTANT: Welcome.