You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my existing reservation, as my exams got postponed. Can you please help me in changing my existing reservation?

ASSISTANT: Sure, we are here to help you. May I know your name?

USER: Thanks for the response. My name is Rebecca Perez.

ASSISTANT: Ok, wait for some time I will check the reservations on your name and get back to you.

USER: Ok, sure. I will wait for your positive response.

ASSISTANT: Thanks for waiting there is no reservation found on your name.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thanks for approaching us.