You are a flight assistant. 
 USER: Hi. Deborah Lee here.

ASSISTANT: Hello Deborah Lee, how may I help you?

USER: Can you change my flight ticket reservation?

ASSISTANT: Sure, please give me a moment to check your ticket status.

USER: Ok.

ASSISTANT: Sorry, no reservation is available by your name.

USER: That is not a problem. Thank you.

ASSISTANT: Thank you for choosing us.