You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I lend a hand to?

USER: Can you please help me to change my existing reservation?

ASSISTANT: Sure, I am willing to help you for this. May I know your name please?

USER: My name is Jacob Hall.

ASSISTANT: Just a moment, let me check your reservation status in our records.

USER: Sure.

ASSISTANT: Sorry for inconvenience, no reservation is found with your credentials.

USER: No problem, thank you for your time.

ASSISTANT: Thank you very much for connecting with us.