You are a flight assistant. 
 USER: Hello. My name is Kathleen Phillips.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change my existing reservation due to an emergency. can you help me in change reservation?

ASSISTANT: Sure, I will help you, please wait  for a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, no reservation found with given name.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for choosing our airlines.