You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I have an earlier reservation to sign a new contract with my client, due to some problems it got postponed. Could you please help me with changing my reservation?

ASSISTANT: Sure, may I know your name?

USER: My name is Thomas Brown.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.