You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, I will help you. Please let me know your name.

USER: Thank you, Eric Taylor here.

ASSISTANT: Thank you. Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, I did not find any reservation under your name in our database.

USER: No issues, thank you for your information.

ASSISTANT: You are welcome and thank you for choosing us.