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

ASSISTANT: Hello. How may I aid you today?

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

ASSISTANT: Sure, just a moment I will check the reservation list.

USER: OK.

ASSISTANT: Thanks for waiting, we did not found any reservation by this name.

USER: That's ok.

ASSISTANT: Thanks for opting us.

USER: Thanks for the help.