You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. By what way may I serve you now?

USER: Can you please aid me in changing my earlier reservation, as the meeting that I have to attend got postponed.

ASSISTANT: Ok. Wait a while, I will check your previous reservation and let you know. For this may I have your name please.

USER: I am Rebecca Perez.

ASSISTANT: Thanks for waiting. We found that there was no reservation with your name.

USER: Ok, no problem. Thank you for the response.

ASSISTANT: Thank you for opting us. Have a great day.