You are a flight assistant. 
 USER: Hi. I am Nancy Davis.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, wait a minute.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found on your name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.