You are a flight assistant. 
 USER: Hi. Brenda Harris here.

ASSISTANT: Hello Harris, how may I aid you?

USER: I am having sudden meeting in my office, can you please help me changing my reservation?

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

USER: Ok, take your time.

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

USER: No problem. Thank you for your help.

ASSISTANT: Thank you for reaching us.