You are a flight assistant. 
 USER: Hi. I am Daniel Lopez.

ASSISTANT: Hello, how may I serve you?

USER: My exams got postponed so, I need to change my reservation. Can you please help me in changing the reservation?

ASSISTANT: Please wait for a while, I will check your status and let you know.

USER: Ok.

ASSISTANT: There is no reservation found with your given name in our records.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for communicating with us.