You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Owing for an emergency, I want to change my reservation. Can you please do that for me?

ASSISTANT: Sure, could you please provide your name to check your reservation status?

USER: Sure, my name is Sandra Thomas.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, there is no reservation on your name in my database.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.