You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I need to change my reservation due to urgent meeting, can you help me?

ASSISTANT: Sure, can you please let me know your name to check with the reservation status?

USER: I am Virginia Roberts.

ASSISTANT: Sorry, there is no active reservation found under your name to change.

USER: That's ok. Thank you.

ASSISTANT: Thank you for reaching us.