You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I abet you today?

USER: I made a reservation earlier this week to attend an exam but it got post pone so I need to reschedule my journey dates. Can you please check the reservation by this name Richard Lee?

ASSISTANT: Sure, I will help you with changing your reservation. Please wait for a minute.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.