You are a flight assistant. 
 USER: Hi. I am Jennifer Baker.

ASSISTANT: Hello, how may I assist you now?

USER: Owing an emergence, I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, I will help you with that. Please wait for a while.

USER: Ok.

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

USER: No problem, thanks for the information.

ASSISTANT: Thank you for reaching us.