You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: I am Anthony Harris. Can you please help me with changing my recent reservation?

ASSISTANT: Sure, I am here to help you for this. Let me check your reservation status in our records.

USER: Ok.

ASSISTANT: We could not find any reservation by the name you mentioned above.

USER:  Oh! That's very sad to know. Anyways, thank you for checking the availability.

ASSISTANT: Thank you for reaching us.