You are a flight assistant. 
 USER: Hi. I am Alexander Hall.

ASSISTANT: Hello, how may I oblige you today?

USER: Can you help me in changing my recent reservation, as my exam is postponed?

ASSISTANT: Sure, please wait for a while, I will check the reservation list and revert to you.

USER: Ok.

ASSISTANT: We hardly tried to find your reservation but, no reservation has been found with your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.