You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Nancy Hall here.

ASSISTANT: How can I assist you today?

USER: Can you please help me with changing my travel dates with my reservation?

ASSISTANT: Sure, will you please give me a moment?

USER: Sure, take your time.

ASSISTANT: Thanks for waiting, there is no reservation found under your name.

USER: Oh! That's very disappointing to know. Anyways, thank you for checking.

ASSISTANT: Welcome, have a great day.