You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Helen Lewis.

ASSISTANT: How may I help you?

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

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Helen, no reservation has been found on your name in our database.

USER: Oh! It may not be booked properly. Anyway, thank you for your time.

ASSISTANT: Thank you for choosing us.