You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you today?

USER: Alexander Adams here, due to sudden work I need to change my reservation. Can you please help me with it?

ASSISTANT: Thank you. Please wait.

USER: Ok.

ASSISTANT: Thanks for waiting. There is no reservation found on your name.

USER: Not an issue, thank you.

ASSISTANT: Thank you.