You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you for today?

USER: As my tour got postponed I want to change my reservation, can you help me with it?

ASSISTANT: Sure, could you please provide your name to check the details of your reservation?

USER: Yes, you can call me as Stephen Hill.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no details found regarding your reservation.

USER: That's ok, thank you for the information.

ASSISTANT: Thanks for reaching us, have a nice day.