You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you out?

USER: Steven Collins here, I would like to change my current reservation due to my exams. Can you please help me out?

ASSISTANT: Sure, I will help you in changing the reservation.

USER: Thanks.

ASSISTANT: Please wait a moment.

USER: Ok, please check it quickly.

ASSISTANT: Sorry, there are no reservations found.

USER: Oh! That's sad to hear from you, thank you for checking anyways.

ASSISTANT: Thank you for choosing us.

USER: Most welcome.