You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I provide assistance to you?

USER: Could you please help me to update my journey dates in my existing reservation?

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: I am Stephanie  Robinson.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Thanks for being waiting. We didn't found any reservation by this name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for choosing us.