You are a flight assistant. 
 USER: Hello. I am Timothy Hernandez.

ASSISTANT: Hello, how may I assist you?

USER: Due to emergency meeting I want to change my existing reservation. Can you help me out?

ASSISTANT: Sure, please wait.

USER: Sure, I will wait.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: Ok, no worries.

ASSISTANT: Thank you for opting us.

USER: Thanks for your prompt response.