You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I lend a hand to?

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

ASSISTANT: Sure, I am here to help you for this. May I know your name please?

USER: My name is Mary Green.

ASSISTANT: Please wait for a while, let me check your reservation status in our records.

USER: Ok.

ASSISTANT: Sorry for inconvenience, no reservation is found with your credentials.

USER: That's ok. Thank you for your service.

ASSISTANT: Thank you very much for connecting with us.