You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you today?

USER: I am Jason Harris. Owing to an emergency I need to change my existing reservation. Can you please help me out?

ASSISTANT: Sure, give me a minute.

USER: OK.

ASSISTANT: There is no reservation found on your name.

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

ASSISTANT: Thank you.